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I put my 32 year old electric car in storage once there is snow on the ground, once every month or two I plug it in to top the batteries off, my batteries are about 5 years old and still in good shape.
On my lithium batteries on my motorcycle I have a thermosensor on each cell in the pack that is part of the battery management system, charging the cell (GBS brand, 100 amp hour cells) I do notice that they get warmer by a few degrees, so far that has just been to top them off, so I'm not sure how warm they would get from a full charge, I'll know in the next few weeks when I get the license plates in the mail.
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