My Phantom acts very strange with a cold battery. Cuts off in mid-calling, won't call without constantly adjusting the volume, etc.
I keep a handwarmer in my shirt pocket and tuck the unit into my pocket periodically to keep it warm. This seems to keep the unit working fine in cold weather. I know the battery is good 'cause it works fine in the house. Solid state circuits, batteries and cold temps just do not co-exist very well at all!!
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illinoisboy
"Home of the fried 'possum fritter"