Originally Posted by squeakywheel
Leaving the lights on the bike wouldn't work for me. It isn't the theft possibility. Its the temperature. You wan't to take your batteries indoors during Minnesota winters. The cold temperature will reduce the batteries output to nil.
For storage, cold is good for batteries. However, when you're asking for juice, warmer is better. So from that perspective squeaky is doing himself a favor by storing the batteries inside, when not in use. The ideal is to store the battery at cold temps, then warm it for use, but thats pretty impractical for bike commuting.