Cost of Ownership: Gas vs Electric

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All of us are current owners of EGO Outdoor Power Equipment, and surely, have thought about the long term "cost benefits" of gas vs. electric.  That said; I came across this article from Consumer Reports regarding this topic, and thought it would be interesting to share with you all ...



According to this article, after 10 years of utilization, both gas and electric mower will even out in terms of "cost of ownership."  Curious what others think about this analysis?

http://www.consumerreports.org/push-mowers/electric-lawn-mowers-that-rival-gas-models/
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David HD, Champion

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Posted 3 years ago

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summetj

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This is a pretty picture, but Consumer Reports did not say that they included the purchase price of a new battery around the 5 year mark.  I do not anticipate the LiIon battery to last a full 10 years before needing replacement.
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David Cline

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How long have you owned one? I can't tell any noticeable degradation of performance in my first batteries from over 3 years ago. Based on that 5 years seems like an arbitrarily low assumption, and 10 years more realistic.
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Blue Angel, Champion

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I'm thinking most people will get closer to ten years out of a battery than five, and even then the battery will still work fine. It just might be down a little on capacity.
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Egocentric

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Well I think if I was doing this on a cost basis, I would not consider battery.  I hope you are all correct on the 10 year battery life but that seems a bit optimistic to me.  I have very little experience with battery operated equipment, so I will be the first to admit...I have no idea.  The convenience is a far bigger factor.  With the chain saw, which just blew me out of the water with how well it worked, it was a no brainer.  It is a once in a blue moon device for me.   But with the other equipment, I am taking a more wait and see attitude.  I got the trimmer last week, but have used it only once just to try it out.  My 20 inch mower come in last night.  So I have to assemble it and give it a go here today.  If I like that, then I am considering the big hand held blower with no battery or charger.  Again convenience, I can't be bothered with a gas or electric blower.  I am far from a lawn purist.  I really don't care if the mower  mulches or not (I am really not sure what mulching is), just so it hacks down the grass to keep the neighbors at bay.  

The other problem I see with long term battery ownership is what happens when you get to 7 or 8 years and the battery goes?  The mower is old but still serviceable.  Will your new battery work with the next generation of  mowers?  Depending on how things evolve, the economics may not support buying a new battery for an older mower.   It is sort of like the old hot dog problem.  Buns come in packages of 8, hot dogs come in packages of 10.  Anything less than 40, either some one doesn't get a bun or you end up with too many.  Again I hope I am wrong, but again I think the convenience still makes it worth while to me.  But I am an old guy and I really don't give a crap if the lawn gets mowed or not.    
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summetj

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I've only had my Ego Mower for a month now, I'm just basing this off of every other battery powered device (cell phone, cordless drills, previous generation of cordless string trimmers/blowers/chainsaws, etc) all of which I've had to buy replacement batteries for before 5 years are up.  I'd love it if the Ego battery lasted 10 years, but I'm budgeting for 4-5 years. (If they are going to last 10 years, why have a 5 year warranty on the mower but only a 3 year on the battery?)
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Blue Angel, Champion

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Your cell phone has a one year battery warranty because it's assumed many people will charge it on a daily basis, and they typically last 2-3 years. Compared to that, if your mower battery gets charged once a week that's 1/7th the charge cycles (for someone who cuts year round) so tripling the expected lifetime doesn't seem too unreasonable. :-)
(Edited)
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summetj

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Unfortunately, LiIon batteries degrade from both calendar age as well as number of charge cycles.
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SLG

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With GigaFactory producing batteries, I can see the battery price will keep dropping down.
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Blue Angel, Champion

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Not that this video is conclusive proof of anything, bu tit is one of several things I've seen in recent times suggesting the calendar life capacity loss of most 18650 lithium cells is less than we think:

https://www.youtube.com/watch?v=4bXYisWDGo0&t=0s

Of course, it is generally accepted that keeping a cell fully charged for extended periods can/will accelerate that capacity loss, so storage condition is important.
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David HD, Champion

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A great video Blue!  You are correct that one video is not a "total" proof of anything, but it is "hard" to argue when there is data present.  That said; I still feel extremely confident in EGO batteries to last beyond 10 years ... an investment I am willing to make, to avoid the hassle of gas, fumes, and yearly maintenance on the old gas power tools.  Thanks for sharing ... :-) 
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@Egocentric, you'd absolutely want to include a battery replacement at the five year mark to have an accurate TCO (Total Cost of Ownership).

Summary for the next point: what battery will Ego come out with next?

Consider that there have essentially been two generations of Ego batteries:
Gen 1, based on 2000 mAh cells (2.0 AH, 4.0 AH batteries)
Gen 2, based on 2500 mAh cells (2.5 AH, 5.0 AH, 7.5 AH)

Given that Tesla is going from 18650 to 2170 cells... let's side track for a quick re-cap on what an 18650 cell is: the first two digits are the diameter of the cell, so 18mm; and the next three are the length, so 65.0mm.  So the new 2170 cells will be 21mm in diameter, and 70mm in length.

So what does that possibly mean for Gen 3 Ego batteries based on the 2170 cell?  Well for a 1P (one parallel string of 14 cells in series [electrically], but physicall arranged as two rows high by seven cells wide [wrapped in a "C" shape], so going to a 2170 would increase the length of the battery by: 10mm (70 - 65 = 5, x2 rows high); and the width would approximately increase by: 21mm (21 - 18 = 3, x7 columns).  Since the batteries are sort of arranged in a "C" shape, that 21mm width, might be more like 20mm wider, and 1mm higher (just to make the next guesses easier).  Carrying that forward to the 2P and 3P:

2P: 22mm higher, 20mm wider (same), 10mm longer (same)
3P: 43mm higher, 20mm wider (same), 10mm longer (same)

So with that said, a Gen 3 battery with those increase dimensions should easily fit into the existing line of mowers and tools.

Conclusion: You might need to buy the five year replacement battery, but by then either the existing 18650 cell batteries will have gone down in price, or the new 2170 cell batteries, with more capacity, should be available at today's prices.
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Egocentric

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Thanks for the explanation on these batteries.   I would love to get 10 years out of one.  Well hope for the best and plan for the worse, but again to me the convenience far outweighs cost. 
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Nice wrapup, aTE.


Since we already have high drain 3000mAh 18650 cells from LG, I wouldn't be surprised to see those used in the 3rd gen batteries before moving to the newer 2170 format.  That would give us 3,6 and 9Ah batteries and would keep the current form factors.


Looking ahead to the 2170 cells, the 1P and 2P packs would need to grow a little in physical size to accommodate the larger cells.  Using the same chemistry as today's high drain 3000mAh 18650 cells, a 2170 with 40% more physical volume should have roughly 4200mAh capacity.  So a 1P battery would be 4.2Ah and a 2P battery would be 8.4Ah.


The 3P battery format might be in trouble.  The battery bay on the mowers/snowblower doesn't have much leftover space with the 7.5Ah battery in there.  The profile would need to be manipulated to squeeze 42 2170 cells in.  Whether that could be done and still fit in the mower/snowblower bays remains to be seen.


It could be that, by the time a 4th gen battery with 2170 cells comes to market, the capacity of those cells has grown enough to make a 3P battery a non-requirement.  By that time a 1P battery could be up to 5Ah and a 2P up to 10Ah, 2.5X the capacity of the original 2 and 4Ah batteries.


Now I could be wrong in that the demand for 3000mAh cells stays high enough that the price doesn't drop and the 2170 becomes more desirable, but I somehow don't think that will happen soon enough to influence a 3rd gen battery, whether it comes nex year or the year after.

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(a)Typical Engineer

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Good call on the Gen 3 being bigger 18660 and Gen 4 bring 2170, I concur. And with Tesla building the giga-fascist, all those current 18650 makers are going to either go to the new form factor or close up shop. But I'm sure Musk's strategy is to make Li-Ion so cheap that one day you will no longer be able to buy an Alkaline battery. So I really think the price will drop, one way or another, or for one reason or another.
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Mike Willcutt

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Well you foget cost of battery disposal. And a 2 hour use before recharge you better own small yard I think these mowers well not last very long you want get tens years out of these mowers with out major costs to keep up.dont trust in there grafic. chart.
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Amber F., Official EGO Rep

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Keep in mind that all of our batteries are recyclable.
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Mike Willcutt

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With 3 year warranty I say it good for 3years 6 months you be replacing it thats about 3 to 4 batterys in ten years cost plus disosal I'll keep running my 95 6 ft gas Dixon two acres half a gallon of gas.
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szwoopp, Champion

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Mike while I am often a fan of snarky answers, there is plenty of evidence on this matter that points to a much longer battery life.
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TheAtomTwister

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Another thing to consider after reading all of this is how much you use the tools. 

Also, I see more stuff on 26650 cells than on 2170 cells.  Tesla and some E-bikes may use the 2170s, but I see more 26650s for sale.  

As far as "And with Tesla building the giga-fascist, all those current 18650 makers are going to either go to the new form factor or close up shop." goes, I'm not buying it.  18650 cells have been around at least since 2006, probably for longer, Tesla Motors was founded in 2003, and while I do not know when it really took off, I do know that Tesla isn't the only one that was demanding 18650 cells.  They aren't going to close up shop because they are still selling cells to so many buyers, ones for laptops, ones for cordless power equipment, etc.  Now, I know that there are high-drain cells and non-high-drain cells, and even ones between (many different chemistries), but I do think they're going to be around for a while.
(Edited)
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Oliver Clark

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I won't buy another battery powered tool as batteries don't last and are expensive my mower battery is $398. Batteries also lose there ability to hold a charge as they age requiring more frequent charging and they are less effective. My honda gas mower is over 12 years old and I keep it around so I can finish mowing my lawn when batteries die.
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Bill Menzel

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Good for you!!!!
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Frank Woodbery

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Saving a few bucks 10 years from now wasn't even in my top 5, no, make that not in my top 10 reasons to buy an electric tool. For the chain saw, it was about noise levels and instant starting. For the different hedge trimmers, it was about avoiding the weight of gas or lack of dealing with a cord for a corded trimmer. I plan to keep my gas mower. and I think tools can both work at whatever they do best.    
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Oliver Clark

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I do plan on keeping my battery hand tools but need better longer lasting and cheaper batteries(I have no gas ones including chain saw). I also am keeping the battery mower (as well as my old Honda). I have solar panels and want to stay electric but won't buy any more until warranties and batteries are improved.
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Brad Carey

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I spent big money on this mower for the convenience and the form factor that allows it to fold up and stand on its side (important for getting my car in the garage over the window). I figured I was paying a premium for this, and was okay with that, however this chart makes me feel even better about my purchase. I'm okay with it taking 10 years to recoup my initial outlay.
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Brad Carey

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I meant to say important for getting my car in the garage over the *winter*.
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szwoopp, Champion

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window painted a much more interesting picture
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Blue Angel, Champion

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Well said, Brad. The convenience is darn near priceless! :-)
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Amber F., Official EGO Rep

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Here’s a similar thread that touches on this, too: https://community.egopowerplus.com/ego/topics/payoff_break_even
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John Zappatos

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I'll be tickled if this thing lasts 10 years but I'll pay the premium for the convenience of not messing with oils or fuels and ability to store it anywhere.  My beef with EGO is they're going to lose me if they don't start producing add on items like edger, vacuum both indoor and shop. 
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David Cline

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The edger is out now. I fully expect a vacuum within 5 years, based on the fact that Ego has been very responsive to customer demand (see SP mower, power head, snow blower, pole saw, edger).
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szwoopp, Champion

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I was willing to spend extra to save on the hassle of maintenance (small engines are not my forte) and enjoy the quiet of operation.  If I come out even in the end money wise then that is a bonus I was not expecting.
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Mike Willcutt

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What convenience you have to charge to often 2hrs on riding mower be pushing back to charger if they had a brain it charge it self while mowing a very simple part to add on to solve mowing time.lol junk
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Cost benefit and analysis aside, I like the reduced emissions. Yes, I know there will be some additional emissions at the power plant where the electricity is made, but since I don't need to charge a battery every time I mow, those emissions will be really minimal compared to spewing uncontrolled emissions every time a gas mower is operated. Plus, I like that it can be folded and stood on edge for stowage and also for ease in cleaning.
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Mike Willcutt

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But your talking no yard to mow lis it's a push mower not riding model
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Cldlhd

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Plus the emissions from a gas mower are far worse than the local power plant for what you're doing.
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SCDC, Champion

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I'm just looking for convenience.  I love that I'm not dealing with gas mixtures, oil, fuel stabilizers, spark plugs, PULL CORDS, etc.

I wouldn't mind if gas ended up cheaper, but over all it probably isn't.  The only thing gas is good for around my house now is my Generator.
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Geoff O

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All that plus effortless starting. The mower works as well as my old gas mower did, had no problem mulching last autumn's leaves.

I finally got fed up with my old gas chain saw which always had issues cranking up. For the level of my use, the EGO is ideal. 
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Blue Angel, Champion

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I can imagine convenience being the #1 reason why most would go cordless electric, especially given the high initial cost.

Whether there's an eventual payback or not, for me anyway, was not even a consideration... there are MANY MANY things to focus on in my daily/monthly expenses that are orders of magnitude greater than the operating cost of my lawn equipment.

Anyone can analyze the operating costs of different types of lawn mowers, but for most people with average sized lawns, the difference in price between a medium and large morning coffee will have a greater effect on your retirement goals. ;-)
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SLG

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Hmm, I need to switch to small morning coffee to retire earlier.

Good point!
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TheAtomTwister

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This is true unless you mow professionally, then you will burn through so much more gas (or so many more batteries in my case).
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Alexander Scott

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I think this is marketed to the guy or gal who cuts his grass, and maybe his parents yard to save the family some money on lawn service. He can plug in at his home and cut his/her grass, put mower/blower in the back of his/her suv, not worry about gas or oil in the vehicle, drive to see his/her parents and plug and cut theirs too.

The only way to possibly use this as a commercial tool with the initial cost of on average of $450 every 5 years, is if you had a battery bank ($500 every 3-5 years) charged by your alternator ($160 diode charge splitter every 5 years + $60 worth of wire and connectors), New ego battery every 3 years ($300) and an inverter every 5 years ($400) to charge the EGO batteries on chargers while you're working. Maintenance is probably a way of life for most professionals, and when you have a bunch of small engines you get pretty good at maintaining them or you outsource the maintenance. Either time or money you are paying for it. Similarly to when you consistently use a small engine daily, you get more hours of run time out of the engine with less maintenance work, lithium batteries generally greatly exceed their expected charge cycles when they are used regularly and not left discharged, which the internal software prevents from happening. The upfront cost of a echo, Stihl, or Husqvarna are probably $300-$500 every 5ish years if you run them constantly. Taking the ICE engines to the shop every season can cost $50-$100 per season. Then you add in a gallon of ethanol free gas and a 1.4 ounces of two cycle oil a day and you are looking at $4 per day 5 days a week 6 months a year at $120 per season. Ego per year cost: $384, Ice equipment per year cost: $275 per year or a $109 dollar difference in favor of ICE. Per trailer/crew you are probably looking at 5 or 6 small engines. That's at the very least $550 or more per year per crew.

I would guess a well paid crew of 4 would cost $18/hr x 40hrs per week x 26 weeks per year = $74,880 per year. The additional equipment cost is 0.07% of what the crew makes, not to mention the truck and trailer cost, truck fuel, insurance, etc. The only way you can justify it is if your customers prefer quiet equipment like if they have an at home job that requires low noise (think masseuse, music studio, tutor, and that's all I can think of) or a wealthy neighborhood, or an environmentalist that may pay more than 1% extra for less noise. There are probably pockets of neighborhoods popping up that are creating niche markets for some ambitious person to fill.

So I guess that's how it is possible. It takes a person whom is willing to find and fill these markets. Not easy but not impossible either. I hope new tech get's more affordable as time goes on so we can get away from ICE. Electricity can be way more fun in my opinion! But I'm told that's called EV MADness!!!

Y'all at EGO hiring?
(Edited)
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Alexander Scott

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The next real hurdle to break into that market is the riding lawnmower. There has to be a way to get a riding lawnmower's cost down to $5000 and have it be able to run for 8hrs with an hour break for lunch to charge. Also it needs to be able to stop to protect the blades, motor, and deck just like the EGO push mowers. This would save a ton of money in deck repairs and new blades. No transmissions to burn up, full analog forward and reverse saving even more money every three or four years on transmission repairs.

There are literally so many cool things you could do with an electric riding mower. I bet you could make it wicked fast without the blades spinning, protect the deck and blades with software, sell solar range extender shade covering, sell bagger/collector that has additional battery plugs to extend range and increase power. Phone charger/holder. AC outlets to power power tools. So much fun you could have with this.
(Edited)
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TheAtomTwister

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You make a few good points, but I do work commercially.  I'm just getting started, and the upfront cost is high, but I buy enough batteries to get me through half the day, then I come back and get everything charged, then I go out for the other half of the day.  This is way easier for me than dealing with gas, plus I maintain the tools because I know my way around electric.  Plus, you can get the EGO backpack blower 5Ah kit, then sell the blower for about $150, and keep the battery and charger.  You can do the same with the mowers, buy them for the battery and charger.  You can save so much money that way.
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Alexander Scott

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I can't believe this includes the cost of rebuilding the carburetor on a gas mower every season. Not to mention the chiropractor visit after pulling it add infinitum when it won't start because of vapor lock, gummed up carb, fouled spark plug, and diagnosis of the bloody issue at hand. Please deliver me to my electric heaven.
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Cldlhd

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I'll be happy if I get 5 to 7 years out of the battery. By then I'm hoping a replacement will be a lot cheaper or they'll be a new battery powered mower I want more. I know it's cheaper per cut but I don't expect to save money over a gas mower as for the $400 I just spent on my EGO lm2101 I could get a decent $250 gas mower and with maintenance I'll get 15 years out of it but you only live once and I like a new toy( if a lawnmower can be called a toy) . Plus I don't have to smell the exhaust, change the oil, plug , air filter etc. It's quieter, I can store it vertically which is helpful in my shed. I can flip it up and remove the blade without worrying about gas or oil dumping out etc...
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TheAtomTwister

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That is why I go electric.  It is just more convenient for me.
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Dave M

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I have all of the ego tools as well as my gas mower and I use all of them. For weekly mowing i prefer the quiet Ego mower so much more than my gas mower because I don't have to blast my radio or headphones and I can talk on my phone while I mow if I need to. The gas is nice when the yard gets really tall because of rain or I want to pick up after leaves and debris towards the end of the season. I'm not rich but I never really considered the price because I can afford both and I have plenty of room. The best thing about the Ego over gas is the headlights and how quiet it is for night time mowing when it's hot. I also like a little less power when I'm re-seeding bare area's of the yard, as the gas will leave marks in the dirt because of the added weight and will ruin the delicate new grass. The Ego is so much lighter it saves my back.
(Edited)
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SCDC, Champion

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A year later (after my last post in this thread), is the continued high price of the batteries.  I just don't see them moving like I had hoped.  LOVE Electric, don't love the cost of the power source.  If EGO could get the pricing down on the larger batteries, it would pretty much alleviate most if not all questions/concerns people have in their minds about going electric.
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Blue Angel, Champion

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There have been many people on this board questioning the investment when the battery replacement cost is 2/3 the price of the whole kit, and rightly so.

The run time argument is also more important when batteries are too expensive; if the included battery doesn’t finish the job you’ll be stuck waiting for it to charge, rather than buying a second battery to swap in. Cheaper batteries mean more batteries and less need for “range anxiety”.
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SCDC, Champion

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Yes sir, i know that feeling about "range anxiety".  Like that term!
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Matt Moore

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This is probably my major concern as well.  We all know that batteries often don't last as long as manufactures state that they will and any sort of replacement inside of 3 years will kill any chance of ROI.  Also agree that the additional battery cost is far too expensive.  I believe that most manufacturers are making high profit on batteries.  This seems to be normal in the industry.  Look at batteries for other battery tools, it is the same scenario.  It is better to buy another tool and get another battery than have to buy a battery outright.
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SCDC, Champion

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Yes, I believe they do that to move more tools, that you would normally not purchase.   Industry standard practice.
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szwoopp, Champion

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Matt - if you had to replace a battery inside of 3 years it would be free under Egos warranty.
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Cldlhd

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I agree. Assuming they priced them at a level where they were still making a decent profit they'd easily make it up in volume. I got my LM 2101 on sale but still $400 is a bit more than most "normal" mowers people are used to. I've been in Home Depot with friends and co-workers and showed them the EGO mowers and usually they think it's cool but too expensive or they think battery powered tools are better for weed wackers or blowers and aren't sold on the idea of a battery powered mower.
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TheAtomTwister

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I myself almost wasn't.  If my gas mower didn't start having problems, I wouldn't have got the one that I did.  For Greenworks: Get a high lift blade.  For EGO, get a real side discharger on the 21 inchers.  For both: Put a turbo button on the handle.
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Matt Moore

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Over 10 years?  How often does any mower gas or electric last for 10 years?  In the case of battery, it does not appear that they have included the cost of at least a few batteries that will be needed over the 10 year period and the fact that it might require that multiple batteries are needed at the outset depending on the size of the yard.

I so want the battery powered to be the thing but the additional and replacement battery cost seems too high and longevity is still unknown to some degree.
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szwoopp, Champion

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I would say most mowers last for 10 years.
And 10 years is a reasonable estimate for the Ego batteries and the number of cycles the battery would go thru
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summetj

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I agree that LiIon batteries can regularly do 1000-2000 cycles. However, they also have a calendar life limitation. I challenge you to find me a laptop, cell phone, or other liIon battery powered device that does not need a battery replacement after 3-6 years.
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szwoopp, Champion

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My Ryobi battery powered tools
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Matt Moore

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This ^^^.   My experience is that rechargeable batteries do not get the life that manufacturers state that they do and/or what we hope they would.  I have used every generation/type of battery in laptops, appliances, hobbies, hand power tools, etc and while there are great benefits to battery power, the batteries are still too expensive from manufacturers and fail too quickly.  In cases where there is a after-market battery option, sometimes the pricing is fair but for battery powered lawn tools that is not the case yet.  I expect that the companies have patents on their battery design and technology at this point and thus closes the market.  Since the market is new, all of the manufacturers are racing to claim market share and for eventually probably to license their technology to other companies.

Inside of 3 years, it is great that Ego will warranty it but this report was based on 10 years and presented a cost comparison that did not include replacement batteries.  IMO, reality would dictate to be prepared to need at least 2 batteries in the 10 year period, but likely 3 and maybe even 4. The TCO  and comparison drastically changes at that point.  

This the same conversation with hybrid cars.  If someone looks at the true TCO especially without the government incentives, a hybrid car is much more costly than gas.  That could change if we were dealing with $5 per gallon gasoline.

I so want the true answer to be different and I believe it will be fairly soon with companies like Ego, Tesla, Dewalt, hobby companies, and many others constantly pushing the battery technology and we are getting close.  
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SCDC, Champion

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Nobody has a crystal ball, but none of my li-ion batteries last very long.  My laptop ones stop holding much of a charge at 4 years, but they do work.  Our phones are pretty much toast after a year (iPhones).  iPads about 3 years. My Garmin Fenix gave 2 years, my Apple Watch about 2 before much reduced battery.  You start to see the picture. 

If I can get 4 good years out of a battery, and get a reasonably priced replacement, I'm good.  

I'm realistic with my expectations. 
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Brad Carey

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Many of the devices listed above as examples will have many more charge cycles than EGO batteries will. I wonder if that'll be the difference.
(Edited)
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szwoopp, Champion

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Only time will tell.  But it is fun and interesting to discuss and analyze the issue 
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SCDC, Champion

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And fun to guess, because that is all we are doing  :).  EGO has much more technology in their battery system than the bare batteries in our consumer devices I listed above.   And when using a non-commercial item, the charge cycles are not high per year.
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Cldlhd

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Ya I charge my phone daily but the mower probably once a week for maybe half the year at most. Probably just over 20 charges a year.
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richbrew

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Personally, I find it interesting that the comparison is vs a $250 mower. If one will spend $500 on an electric mower, the competition is more likely to be a $400/$500 Honda. In that case, the electric wins the TCO in year 1 and the rest is bonus.
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szwoopp, Champion

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Great point richbrew !
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Oregon Mike, Champion

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Sure, but that's not really the point of the comparison. I think most will buy something gas powered in the $250 range because that is a popular price point for gas mowers. And Consumer Reports' top rated mower at the time of the report costs $250. Ego doesn't offer a mower at that price point. I think the best price right now is $399. So, the comparison is apt. The slope will be different because the comparison was made at $499 instead of $399. I imagine if Ego offered a $250 mower then the comparison wouldn't work and electric would win out every time, but since they don't it does. The comparison isn't really about if one were to upgrade to a more expensive gas mower, but what the average person would pay for a gas mower and how cost of ownership compares to Ego's offering. Also, the comparison goes into yard size as well which would require more than one battery if the yard were large enough to run down only one battery.
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Cldlhd

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I disagree. A $250 gas mower would do what I need and cut just fine so I wouldn't pay $400 or $500 for one. However if I want a good battery powered mower I have to pay $400 so I did because I want an electric mower.
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szwoopp, Champion

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I think we all understand the math.  The point is when making a comparison you have to factor in what the choice is for YOU.
Some can use the chart as is
Some wouldn't buy a $250 gas mower, so need to make that adjustment.
Some are certain they will have to purchase 3 batteries in order to make it 10 years
Some think 10 years is realistic for the life of one battery (particularly an Ego battery with all of its technology)
and so on.
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Cldlhd

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I agree . I'm just saying that for myself if I was getting a gas mower I wouldn't have spent $400 but I did for the EGO.