What is the life expectancy of the 7.5ah battery?

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  • Updated 3 years ago
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What is the number of times the 7.5ah battery can be recharged?
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Peter Benedetto

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Posted 3 years ago

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Dave .

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I learned long ago to take those stats with a HUGE grain of salt.  Don't be swayed in either direction by claims of "life expectancy" of a battery.  Either in years, or in number of cycles.  If you are lucky, you'll get close to the ratings.  Do you feel lucky?  :)
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Blue Angel, Champion

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Ego uses high performance Samsung 25R cells. At their full discharge rating of 20A they are rated to exceed 250 cycles at 60% capacity. But I need to emphasize that 20A rating; the 1000W motor in the SP mower will draw roughly 20A from the entire battery pack, and since the 7.5Ah battery shares that load between 3 parallel strings of cells, each cell will see 1/3 of the load, or roughly 6.7A.

Suffice to say the 25R cells in the 7.5Ah battery will FAR outlast their 250 cycle rating. But even at 250 cycles, that's equivalent to someone mowing their lawn every week for 5 years, and only if the cells are fully charged to 100% capacity at the start and drained to 0% capacity at the end. Since Ego's battery management is somewhat conservative, even depleting the battery is not equivalent to a full cycle.

Long story short, as long as the battery pack doesn't suffer any unforeseen issues, it should last the average person somewhere between 5-10 years.

Here's a very detailed report on the Samsung 25R cells if you want to read it:

https://batterybro.com/blogs/18650-wh...
(Edited)
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Peter Benedetto

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Well that doesn't really answer my question, does it? By the way, this ain't my first rodeo . I was asking what the CLAIMED life expectancy was, thanks .
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Ken, Champion

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But you didn't ask what the CLAIMED life expectancy is. You asked, to quote: "What is the number of times the 7.5ah battery can be recharged?"

Dave and Blue Angel both gave you valid answers.

I'm not sure Ego claims a number of expected charge/discharge cycles because, as Dave rightly indicated, such claims need to be taken with a grain of salt. There are too many variables from one user to the next.

What's important is that Ego's batteries carry a three-year warranty.
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Peter Benedetto

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Hey Ken, I thought I asked a fairly simple question that Dave didn't answer. If Dave is your buddy and I offended him or you I am sorry. I see from the number of points you have , you must have a lot of time on your hands to troll this website. I do not, I was only looking for some USEFULL information. This will be my last post because I have no time for morons.
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David Phillips

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300 to 400 is typical of the battery technology but there are factors you can't control like the low and high voltage cutoff and the balancing of cells which could shorten the cycles you get. What you can control is storage voltage and temperature to prolong the battery. It is supposed to go to storage voltage automatically at 30 days of storage. Don't store it discharged and recharge every few months.
(Edited)
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Peter Benedetto

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That was not a reply to you,Blue Angel. That was for Dave. At least your answer had useful info. Thanks
(Edited)
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Blue Angel, Champion

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I figured that! :-)
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Jacob

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Sorry Peter that this forum upset you. Please give it another shot when you need some help in the future.
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Dave .

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Wow, such anger!   You will prolly be happier if you call EGO and ask them your question directly, as we are "morons" here.
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Jennifer VandeWater, Community Manager

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Official Response
You may know that battery life is usually measured in terms of recharge cycles. It is nearly impossible to predict the number of cycles your battery will produce because of varying environmental conditions. We do have a 3 (three) year warranty on all batteries and chargers, so you can feel confident knowing your battery will be protected in the unlikely event that it doesn’t function properly in those first three years of ownership.

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