I don't think this would help much. The problem with batteries in the cold
is that their voltage goes down. It is chemical property. It's not that they
lose charge, so I don't think that will help.
Perhaps a battery warmer will help.
a metal plate that heats up under the battery would be more in line for
low temperatures and batteries than a charger.. j.c. whitney catalog has
them for a few bucks, you plug them in just like an engine heater....
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