7.5 AH Battery Life data

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  • Updated 5 months ago
I compared the capacity of my original 7.5 AH battery (3+ years old with a Dec 2014 manufacture date, but purchased in April 2017) that I have been using for 15 months to a brand new 7.5 AH battery (May 2018 manufacture date) that I just purchased.

My original battery has 80% of the capacity of the new battery.
I estimate the original battery lost 7% of it's capacity before I started to take measurements (years of storage plus the first few months of ownership). It lost 13% of it's capacity over the last 12 months of usage. (Living in Florida, with a big lawn, I'm hitting it relatively hard, with multiple recharge cycles per week.)

The loss "curve" appears to be relatively flat (at least for the year of data I have collected so far) and if it stays that way, it looks like I should be at around 59-70% of the original capacity at the 3 year of ownership mark.

You can read about the raw data and see some graphs at the following URL:
https://www.summet.com/blog/2018/07/11/degregation-of-ego-7-5-ah-lawnmower-batteries-over-time/
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summetj

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Posted 5 months ago

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Irma Maldonado

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I just bougth this batterie last December 2017: charger and batterie not working
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Blue Angel, Champion

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Contact Ego Customer Service and get a warranty replacement.
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Blue Angel, Champion

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Nicely done! I was measuring the same and writing it on painter’s tape applied to the end cap. It would have been far more useful to write it down somewhere! Lol.