caring for batteries

[franklin pug]

I have an unheated shop and its getting pretty darn cold here in Canada as December approaches. Should I take my cordless tool battereies in the house? If so, what is the reasoning behind it?

[Disaster]

Bring 'em inside if it gets below freezing in your shop. Also, when the batteries are cold the performance will be dismal. When not using them for a while run them down in a tool. If you are going to be using them in a week or two, you can slow the self-discharge down by keeping them in the refrigerator (not freezer...see earlier remark.) Just let them warm up a little before using them.