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130 Points
Posted 3 years ago
Oregon Mike, Champion
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72,412 Points
Price on HD website is $398.21 for the 7.5 ah battery.
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130 Points
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6,328 Points
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64,960 Points
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90 Points
Their 56V 7.5AH batteries are about $360. They contain 48 of those 18650 cells. That's under $170 worth of those batteries - and that's consumer pricing. Bulk pricing on them would be $100-130 or even less. I don't know what they were researching and developing for these batteries but obviously not much.
Blue Angel, Champion
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179,948 Points
What I see from battery bro is 60% after 250 cycles at the cell’s maximum rating of 20A:
https://batterybro.com/blogs/18650-wh...
Now look at an aggressive Ego application like a small 1P 2.5Ah battery in a blower that discharges in 10 minutes. A fully charged 25R will run at 15A if discharged in 10 minutes, only 75% of its rated discharge rate. So right there we’d expect to see higher than 60% capacity after 250 cycles, quite a bit higher actually since the cells will be operating at a much lower temperature.
Now consider Ego’s phase change cooling sleeves that limit cell temperature during discharge and forced air cooling during charging. This will keep temperatures much lower than open air discharge testing at 15A.
And finally, Outdoor Power Equipment in a consumer application gets used about once a week on average. If we assume the cells keep only about 80% of their capacity after 250 cycles (likely a conservative estimate), then that’s 80% capacity after about 5 years of continuous use.
This is pretty much a worst case scenario using Ego’s smallest battery in a very high drain device running wide open from start to finish. Batteries are typically discharged at 1/3 that rate (30 min) or even less.
So please explain to me how the Samsung 25R is not well suited to this application?
szwoopp, Champion
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105,538 Points
Rather many people chose the Ego platform specifically because of their batteries
Blue Angel, Champion
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179,948 Points
It should be noted that the Samsung 25R is a very popular cell in smaller battery power tool platforms as well. Makita, Milwaukee, DeWalt and likely a lot more have all used Samsung’s 25R cell.
Blue Angel, Champion
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180,008 Points
They are officially rated at 250 cycles, but that is at a continuous drain of 20A, their maximum rating.
Even if the 1000W motor in the 21" SP mower was running continuously at full power (it never will), the mower would draw 20A from the battery. Since the 7.5Ah battery has three parallel strings of cells (3P), each string of cells (therefore each cell) will see only 1/3 of that, or about 6.6A.
Depleting the cells at 6.6A instead of the rated 20A will lengthen their cycle life considerably compared to the 250 cycle rating, and that's IF the mower was drawing 100% load at all times, which would never be the case.
Also, Ego's Battery Management System doesn't charge the cells to their full 4.2V 100% charge capacity, nor does it drain them to their minimum 2.5V 0% capacity, both of which also reduce the impact of cycling.
If you figure mowing once a week (50 times per year), you can conclude that for most people the batteries will age faster due to time than cycling.
My personal estimate is 5-10 years depending on conditions, but it could be longer for someone who doesn't need all of it's capacity to get the job done. If the battery is 10 years old and has fallen to 60% of its original capacity, the battery is still good if it has enough juice to get the job done.
Simple answer: It depends. :-)
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264 Points
Where you find, EGO do not charge battery to 100%. I see people reporting 58.x V after fully charged. Isn't it near 100% ?
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264 Points
Blue Angel, Champion
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180,008 Points
- 60 Points
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65,000 Points
Blue Angel, Champion
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180,008 Points
If you want to know what happened with the phones read this article:
https://www.cnet.com/news/samsung-gal...
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90 Points
Ken, Champion
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73,580 Points
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65,000 Points
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8,810 Points
I ended up getting the mower and more after doing some research. I also thought about my same worries with power tools. I purchased Makita 18V LXT tool set at least 10 years ago and have been good about rotating the batteries and keeping them charged and they all still work today. I have added more Makita tools and batteries as time has passed. Not only has the price of the batteries dropped but I can get double the A-Hr's today from the same size battery. I'm hoping with added competition for EGO the same will happen in this industry.
Mike
Blue Angel, Champion
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179,968 Points
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152 Points
- 72 Points
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65,000 Points
szwoopp, Champion
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105,650 Points
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536 Points
Even Apple has come around to acknowledging the truth. The company used to recommend a procedure for what they claimed was reconfiguring the battery. What the procedure actually did was to reset the 100% mark to the current full charge--which might be 98% or it might be 75% or less. Now at least there is a settings screen labeled "battery health" that tells you the actual current max charge capacity. My iPhone 7, for example, is at 92% of its original capacity. It almost never goes below about 80%, as I have it connected to chargers on my desk, in the kitchen, and in my car. I carry both a charger and spare external battery in my briefcase.
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64,920 Points
Shelf life,
Charge discharge cycles, unless your like me, you will only charge them a few hundred times over 7 years.
7 years of life will cause more damage to the battery than your charger. Especially if kept at full charge all the time.
szwoopp, Champion
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104,926 Points
William - best = "topping off whenever possible"
Jacob - worst = "Especially if kept at full charge all the time"
?
William - yours seems to be opposite of things I have read and the manuals. And Ego's 30% long term storage default.
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64,920 Points
https://batteryuniversity.com/learn/a...
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2,112 Points
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516 Points
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- 72 Points
szwoopp, Champion
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105,650 Points
Batteries degrade gradually and some loss of power is normal.
There are a many variables. Have you been mulching your grass and thus it is now thicker and healthier than a year ago ? I know that happened with mine.
There has been a lot of rain in my area this year. Again my lawn is thicker than normal and higher moisture content than last year.
Have you sharpened your blade since you got the mower ?
Just some things that can shorten the battery run time even if the battery has the same or nearly the same power.
You will have to determine if you think the battery has deteriorated beyond normal amounts. If so, give Ego a call and see if they agree. If yes, they will send you a new one.
Good luck. Fill us in with a follow up.
- 60 Points
So reading all the battery comments, if not fully discharged after use, rather than fully recharge it should I let it sit partially charged until I need it again then recharge it fully? Don't keep it very warm but do keep it where it is not cold but temperature controlled like in the house or basement, not an unheated garage(for storage) per the saw manual.
Another question, when is a battery considered "replacable" by EGO per the 3 year warranty? At 2/3 life, half life or not until failing to charge at all?
Is it better to use a small battery when long run time is not a concern For example should I use my 2.5 AH batteries instead of my 5 AH battery on my 18 inch chain saw if they do not run down within the time length I use the saw? Or is this "faster drain" harder on those batteries even if for less than a full charge cycle. Most every question seems to have two opposite answers. Should I be sticking with my Makita line? At least they do not have $350 batteries.
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658 Points
Disclaimers aside, here's what I've learned regarding your questions:
- Best practice is to avoid letting your batteries sit idle for long periods of time with a full charge. Ego batteries actually have a built-in "self-discharge" function to discharge down to 30% after several months of inactivity to protect against user oversight regarding this point.
- Lithium-ion batteries are somewhat temperature sensitive, so storing them away from high heat or extreme cold is a good idea. I keep my Ryobi batteries for my power tools stored in my house for this reason.
- Your question regarding when Ego will replace a battery under warranty is a good one that I am unable to answer. I would be curious to know the answer to this myself.
- From what I have gathered, it is better for long term battery health and longevity to use as large of a battery as possible for a given job. This has the effect of dividing the "drain amount" you referenced across more battery cells, reducing the strain (and associated heat produced) on each.
- As an aside, you won't be able to obtain the full power output of certain tools in the Ego lineup with battery sizes under 5.0 Ah. This effects primarily the chainsaws, power head multi-tool, push mowers, and snow blowers.
That said, Makita falls short for my (commercial) needs due to the absence of any backpack battery, backpack battery harness systems, or backpack blower in their current lineup. In addition, their dedicated string trimmer has a cutting swath of only 13.75" vs. 15" on the Ego models.
Oregon Mike, Champion
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71,454 Points
Depending on the battery charge, it will automatically perform a self-discharge operation after one month of storage. After this self-maintenance, the battery pack will enter sleep mode and maintain 30% of its charge capacity. If stored for a month or longer, fully recharge the battery before the next use.
szwoopp, Champion
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105,650 Points
Example - if you have a battery that is at 50% capacity after 1 year of use, I would think you could make a claim and get a replacement. If you have a battery that is at 75% after 2.5 years probably would not get a replacement. ***just throwing out some generalizations - not meant to be exact **
Personally - I had a battery that did not self discharge over the winter (this was before I got a snowblower and made my batteries year round workers) and was easily able to get it replaced.
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658 Points
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Power+ Batteries & Chargers
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Egocentric
I have no idea how long the average battery will last, but my thought is that Ego warranty is well below the average life. Kicking around here I have seen estimates of up to 10 years. That sounds a little optimistic to me. My guess is that for the average battery and the average user you are looking at 5 to 7 years. Now what is an average user? The person who lives in Montreal is going to have a far different average use than a person who lives in Houston if you are talking mowers.
Anyhow that is my guess, and that is exactly what it is, a guess.
Douglas Bass
Jacob
Also I don't store mine at the recommended storing voltage. Mine are always charged unless they go into storage mode after 30 days if no use. And I am not at all nice to my batteries. I use them on my own built mower.
szwoopp, Champion
A new charger to go with a new battery investment might be cheap insurance.
Perhaps a calm telling of the whole story to Ego CS might get you something.