Stored battery is hot

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This conversation has been merged. Please reference the main conversation: Battery is warm when not-in-use

Had my 56V 2.0ah Battery stored on a peg board, vertical on its long side. Took it down from the board and felt the button end of it was hot. Other EGO battery (56v 2.5ah) stored the same way was not hot. The 2.0ah hasn't been used in awhile, maybe 30 days. Did I happen to catch it in the middle of the self-discharge cycle? Would that make it hot? If not, any ideas why one is hot and the other isn't? OK to store a battery on its side?
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max57

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Posted 4 years ago

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Blue Angel, Champion

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Max, you're exactly right. After 30 days of sitting the battery goes through a discharge cycle and it discharges to 30% capacity by generating heat in the end cap.

I witnessed this exact same thing on two of my batteries that I had stored. I let Ego know at the time because I felt there should be something in the owners manual that covers this so that people don't think their batteries are defective.

As far as I can tell no such note has been added to the manuals yet. Either way it's 100% normal and you have nothing to worry about. :-)
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max57

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Thanks so much, Blue. Really helpful!
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Any time! :-)
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Exrace

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This is one reason I don't charge and place on shelf. I charge "just in time" before each mowing/trimming session with all my batteries. Blower is next on list. :)
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I agree 100%, though I personally would do a 100% charge before intending to store the batteries for a long time. This would ensure the battery can properly discharge to 30% for long-term storage.

By not doing so, we would be unaware of the charge level (after use) and the remaining charge could potentially be too low to survive the storage period.
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Exrace

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Good point...end of season I will charge to 50% and place on my charging shelf in garage!

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