I think the extreme cold does affect most batteries, although not sure which are more severely affected, I have bosch lithium ones and they were so cold from the van they refused to charge until they'd warmed up for a while, then the charger would charge them.

yep you have to warm them up often as not

although makita take it to a new level selecting according to the dish off the day
probably charges ok on a full english breakfast  

Yep that all makes sense what you said CW, explains some problems I had getting batteries to charge and with them not lasting as long outside. Mind we were working in -3 for 8-hours so you can't complain (about the batteries at least!)  

Lectrician wrote on Dec 13^th, 2010, 9:53pm:

Yep, that's what the Bosch 36V charger said too with a red light, so had to leave the battery disconnected for an hour or so then tried again and it was fine.