Second batteries and recommendations on battery use

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Is there any benefit in buying a second battery and alternate their usage to extend the life of both batteries. Also are there recommendation on how to extend battery life. I tend to run the battery right down, recharge it fully straight away and do the same a week later. I'm many using a 2024SP mower
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Steve D

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Posted 3 years ago

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szwoopp, Champion

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Using 2 batteries half as much would theoretically make them last twice as long, so it really gets you no better results than buying 1 using it for several years until it dies and then buying a second and using it.

I think the benefit to 2 batteries is convenience if you need more than 1 battery worth of power to get your normal work done.  Then you do not have to wait for recharging. Also, you can get a substantial discount when purchasing a second tool as a kit with a battery included.

Another argument for one battery now and one in the future is batteries should improve and costs should come down. 
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Blue Angel, Champion

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Official Response
Generally speaking, lithium batteries last longest if stored at a partial charge. This is why Ego batteries have a built in storage mode that drops the charge level to 30% after 30 days of inactivity.

My personal approach is to use the battery and then leave it. I charge just before mowing. This makes me feel all warm and fuzzy inside, but realistically I have no idea how much of a difference this approach will make long term.

I personally wouldn't bother getting a second battery for the sake of extending battery life, but having a second and perhaps different size battery could be useful in case one stopped working or you wanted a smaller battery for a handheld tool for example.
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Ken, Champion

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I agree about not charging right away and leaving the battery to sit for a week.

I just wait and charge the battery the night before I use it, or I'll put it on the charger when I leave for work if I'm going to mow after work.

If the battery is red when I'm done mowing I'll put it on the charger for 10 minutes to partially recharge.
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Steve D

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Many thanks all. I hadn't appreciated the built in storage mode. The answer seems to be not to get a second battery and to partially charge . I'll be changing how I use the battery and save on the second one until actually needed. Very useful input all
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(a)Typical Engineer

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I would not buy a 2nd 7.5AH, unless you bought it as part of another tool combo.  Or a tool combo with a 5.0 like a multi-tool or chainsaw or backpack blower if you have use for those.  Given the frequency of reported issues with the battery; if you have two, and have a problem, then at least you can "limp" along until you get the primary replaced.  With only one battery, you're dead in the water. As said above, really comes down to your individual situation.