Lifespan of 7.5amp battery and cost to replace?

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I'm considering purchasing an EGO 21" Power+ Self-Propelled mower. At Home Depot price is around $499. How many mowing seasons should I expect to get out of the 7.5 battery pack before it needs to be replaced? What should I expect to pay for a replacement battery?
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Sandy

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Posted 1 month ago

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SCDC, Champion

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Want honesty?  I'm seeing about 3 seasons of heavy use.  I've had to have 2 of mine replaced, luckily both just under 3 years so under warranty.  Others may be having much better luck!!

Pricing seems to be in the low $300's.  So best to just get it in a tool with kit.
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Pete Innes

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Had ours for 2 years and we cut 50 properties per week. So think of the amount of charges we do. We’ve had 1 battery fail but was replaced under warranty. The others are all working like a champ
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TheAtomTwister

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Always good to hear that lawn guys like myself are having good luck with batteries.
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szwoopp, Champion

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I am expecting 10 years from mine
$499 is a great price for that kit
7.5 is currently $358 at HD
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Howard Hoffman

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Life expectancy depends on how well you take care of the battery according to the battery owners manual. The 56 volt 7.5 ah is $359.00 with the 3 year warranty at Home Depot. But eBay sells it for $278.00 without the warranty, the 3 year warranty is $41.00 more. This battery provides the optimum performance for your mower. You can can save buying a lower amp battery, but run times do change. Love the mower when the power increases when you cutting into some high or thick grass, and then decreases when power is not needed. I don’t know if smaller amp battery will still give me this type of performance. But love ❤️ the technology!
(Edited)
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Ken, Champion

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I have a 2.0, 2.5, 4.0 and 5.0 Ah batteries, with the 2 and 4 being three years old and the others being 2 years old. All are used multiple times per week and all are still holding charges like they were new.

I still think the 5.0 Ah battery is Ego's sweet spot. It has excellent runtime and is $220 on its own. The 7.5 is a great battery if you get it with a kit, but if I ever had one die out of warranty I'd replace it with a 5.0.
(Edited)
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Blue Angel, Champion

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I have 2, 2.5, 4 and 5Ah batteries. All are doing very well except my original 4Ah, which started acting up and was replaced under warranty about 2.5 years in. It still works but goes into “overtemp” on the mower and shuts down.

Barring any electronics issues, the cells should be good for 10 years or more for most residential users.
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TheAtomTwister

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One thing I might change with the mower is I would put some kind of air vent in the battery chamber.  It might need an air filter, which is the only downside, but that would help keep the battery cool.  Additionally, I must note that I do not have an EGO mower, but a neighbor that has since moved away had one and I got to work with it a small bit, and I do not remember seeing any vents in the battery chamber.

Also, copied from another post of mine, "a tip for maximizing the battery packs' longevity: when not in use, keep the batteries partially charged.  30-40% charge is ideal for storage, but anything other than keeping them fully charged or fully discharged would help quite a bit."  Batteries being stored fully charged or fully discharged I think is why the thought, "Lithium-ion batteries like to be used" flies around a bit, which is contrary to NiMH and other battery types, so long as you do not heat them up too much.
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TheAtomTwister

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One thing I might change with the mower is I would put some kind of air vent in the battery chamber.  It might need an air filter, which is the only downside, but that would help keep the battery cool.  Additionally, I must note that I do not have an EGO mower, but a neighbor that has since moved away had one and I got to work with it a small bit, and I do not remember seeing any vents in the battery chamber.

Also, copied from another post of mine, "a tip for maximizing the battery packs' longevity: when not in use, keep the batteries partially charged.  30-40% charge is ideal for storage, but anything other than keeping them fully charged or fully discharged would help quite a bit."  Batteries being stored fully charged or fully discharged I think is why the thought, "Lithium-ion batteries like to be used" flies around a bit, which is contrary to NiMH and other battery types, so long as you do not heat them up too much.
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Jack Tyler

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Li-On batteries come in many flavors so an E-bike, iPad and E-lawn mower don't all share the exact same LiOn chemistry.  But in general, 'good care' of a LiOn battery means not drawing it down to zero, leaving it in a semi-charged state (vs. completely full or empty) when stored, insuring warm winter storage if living in a seasonal climate, and not leaving it in the charger once it's fully charged.  Or at least those are suggestions I've received from E-bike manufacturers and Ryobi.  Daniel at Ego might be a good tech support contact to learn more.
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Blue Angel, Champion

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Many of those care items are baked right into the electronics in the Ego batteries, one of their strongest features IMO.
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TheAtomTwister

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I am not sure that the term LiOn is a proper reference to lithium ion, I think that might actually refer to a completely different type of battery, correct me if I'm wrong.

The only thing I would like to see changed is for the storage mode of the EGO batteries to set in with the push of a button (or two buttons at the same time to prevent accidents) instead of a 30 day wait, which is plenty of time for the battery to degrade from being fully charged in storage.
(Edited)
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Blue Angel, Champion

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Offering a manual method of reducing battery degradation would be to admit that the battery system has a weakness. Try getting that through the marketing department.

In this day and age of technologically complicated consumer gadgetry, ignorance is bliss as far as most are concerned. Things need to “just work” without requiring a deeper understanding of how. Only nerds like us know or care about the small technical details that make things tick behind the curtain.

I think Ego has done a very good job at offering the 95% solution. Could it be better? Technically yes, but every layer of “functionality” you and I get is another layer of “complexity” for the average consumer. It’s a slippery slope and product planners generally like to play it safe.
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TheAtomTwister

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"Offering a manual method of reducing battery degradation would be to admit that the battery system has a weakness. Try getting that through the marketing department." 

In my perception, this is not a matter of marketing and does not have to get through the marketing department, it needs to get through to the engineering department.  As the great Mr. Spock said, to deny the facts is illogical.  It is not a critical weakness, but a weakness it is nonetheless.  EGO Always strives to make their products more perfect than they were before.

In my mind, a storage mode is simple enough and simply stating that it maximizes the longevity of the pack in the manual is simple enough, and I'm betting that many other regular guys and gals will think the same thing.  The reasons behind why the batteries last longer in storage mode they do not have to know, but they can if they want to, which means for the most part, that only the nerds like us will know.

Every time I suggest in idea now of days, I always keep in mind not to make interfaces too complex to the point where people will complain about the tools being to difficult to use.  I also keep in mind price point.  Every new component that you add to the units increase their production cost, which will drive up the price, which would defeat what EGO is trying to do.  Yes, their stuff is expensive, but not unaffordably so.  That is one thing we do not want to change.

In the end, I think the benefits just might outweigh the detriments.  Top that off with the idea of adding a new feature to the pack in my mind does not require EGO to say that something is wrong with the old one, the old one is just fine just like the 480 blower was, but the 530 is better.
(Edited)