The Other Mike wrote:
On Tue, 17 Jan 2012 13:05:26 +0000, Clive George
wrote:

My friend's Lada manual had a bit saying if it was really cold, turn the
headlamps on to warm the battery up before trying to start :-)

Nothing wrong with doing that. Standard practice in cold countries.
A slightly less than frozen, partly discharged battery turns over an
engine better than a fully charged near frozen battery.

Most battery powered tools need to be used for a while in cold weather
before the have full power.

Bill