Can I leave my battery in mower until it needs recharging?

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  • Updated 4 years ago
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I usually can mow 2-3 times before the battery needs charging.  Do you leave it in the mower after your first mow, or do you take it out and put it on charger even though it doesn't need charging yet.  Also, is it okay to leave it on charger even after it is full?
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Heather Mullen

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Posted 4 years ago

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Yeah, you can do whatever you want.  It won't overcharge if left on the charger, so that's all fine and dandy.  

I never leave my packs in the tools, just because I'm OCD and like to keep them comfortably cool in my air-conditioned homestead.  I'll usually put 'em on my charger for just a wee bit, 'till they just pass the 50% marker (I've got two of the super-chargers - the cooler looking ones that are all burley and show charging percentages), then take them off until I get ready to use them again.  This way, they're semi-stored at a nice voltage, they're happier that way.  When I get ready to use 'em, I'll slap 'em on the chargers again to top 'em off right before use.  

I also remove them from my machines for safety.  Just so nothing starts or drains without my knowing.  Like if I left the light on on the mower, or if I left the trigger resting on something activating my trimmer ever-so-slightly.  You gnaw'm sayin'? 
By the way, it's healthier for the batteries if you stop doing it the way you've been doing it.  Draining them all the way down is harder on Li-Ion cells, compared to keeping them at "unity" as much as possible.  3.7V per cell (51.8V per pack) is their happy place, which might be around 50% charged, but I don't know for sure.  

If I were YOU, I'd mow, then leave them in that state, then charge right before using them again.  
(Edited)
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SCDC, Champion

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1.5 years with my setup.  Batteries operate perfectly and I throw them in charger after using them and don't even look at them until I need them again.  Run times have been a bit better in year 2.  So I don't see the urgency about this whole subject.

I would not run the battery fully out, when your mower says low battery, stop and charge or grab a charged one.  Store in a cool dry place and don't worry.  You are supposed to have to worry.  Look at all of your hand tools, do you worry so much about those batteries?  These are lawn tools and the batteries are designed to "take it".

Just don't store them in a warm/hot place and that is about all there is to it. 

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David Cline

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I prefer to keep mine charged up and ready to go, so I leave mine on the charger too.

Plus this way I'll already be in the habit of keeping batteries charged up and ready to use in the emergency station (that hopefully Ego will be announcing any day now...)
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Blue Angel, Champion

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I charge just before mowing, then let them sit since I only deplete the batteries about 50%.

This, in theory, SHOULD be better for the batteries. In reality, it likely makes little difference.

Heather, since Lithium batteries don't suffer from a memory effect, you're pretty much free to do as you please. The only thing I will caution against is fully depleting the battery (red light) and then letting it sit for long periods before charging. This has the potential to KILL the pack, since all cells discharge with time, and no cell is immune to the effects of an over discharged condition.

With your current routine of cutting three times before charging, I would recommend charging immediately after the third cut. I would think your batteries will live a long productive life that way. :-)
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Tim1951

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I'm not sure where you are located, but in the Houston area garages get very warm this time of year. My practice is to recharge every battery after use and then bring them into the house until the next use.
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Tim1951

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I have 3 Ego (1 4ah and 2 2ah) and 1 Ryobi 24 volt batteries that after charging are kept on the shelf in a hall closet until the next use. I used them all yesterday with the temperature in the upper 90s and everything worked perfectly.
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David Cline

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Same here Tim. Thankfully for those of us who don't have the luxury of storing them in the house, they only need a few hours inside to cool down from being out in the garage.
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Tim1951

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Here are mine charged and ready to go....
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SCDC, Champion

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David, that's funny.  I have the opposite problem.  My wife would horde if I didn't keep her in check.  She can't resist a kitchen "tool", storage container, contraption, gimmick.  My god she has more cookware than Outback Steakhouse. 

I get this little corner in the sewing room (once again the sewing room has 3 walls full of thread spools, table with sergers, sewing machines, embroidery.  

Why do men lose this battle so often.  Well, maybe because it's much nicer to have that beautiful woman by our side than a battery powered companion that need charging.  :-O

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Blue Angel, Champion

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We don't necessarily lose the battle... we get the garage! As far as I'm concerned, she can have the house. :-)