What are the batteries' voltage?

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  • Updated 2 years ago
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Hi i just wanted to know how many cells the 4ah battery pack has and what the minimum voltage the 4ah battery pack should drop to after being used and the red light on the mower lights up ? Fully charged the voltage on my 4ah battery is showing 58.3 volts is this also correct ?I would like to know this as there is no way of knowing from the standard charger or the battery as to what percentage of charge is on the battery. I would like to store the battery with 30% percent charge immediately after using. (And not wait for the battery to do this.)Thanks a lot .
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Kunal Bakshi

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Posted 5 years ago

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Blue Angel, Champion

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Official Response
The two amp hour battery uses 14 cells in series, the four amp hour battery uses two groups of 14 cells in series. Ego uses a 4 V per cell measurement to report their pack voltage, similar to what Dewalt does with their 20 V Max cordless tools which have the same number of cells as 18 V tools.

If you really want to know the exact voltage at 30% capacity why not just let one of your batteries sit for a month and then measure the voltage after the pack has self drained?

If you can't wait a month, drain the pack until the mower shuts off due to low voltage and then measure the minimum voltage on the pack. Figure out the 30% point between minimum and maximum voltage and go from there.

My personal approach is to use the battery for cutting the lawn and then not recharge it afterwards. I charge the battery just before cutting the lawn the next time around. This means that while the battery is sitting between uses it is not sitting at 100% charge, which is not the best way to store the cells for longevity.

I think trying to target 30% remaining charge might be an overkill approach to maximizing your battery's useful life, but that is only my opinion. From what I've read, storing lithium cells at anything less than 80% charge gets you most of the way there. Cutting my lawn depletes the battery to almost 50% so that should be pretty good for extending the battery's life.

Hope that helps.