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I'm not sure about lithium batteries, but I do know the cold will kill a Ni-cad battery. I left a radio with the battery in a friend's trailer, that ended up parked for the winter in the Rockies, near Breckenridge. The battery was only a year old, and refused to take a charge the following spring.
The lawn tractor battery seems to last 3 - 4 seasons, left in the garage over the winter with a less than full charged, but not dead battery. I'll usually put it on the charger for about 30 minutes before the first use of the spring, but other than that it doesn't need any other help.
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