Join Date: Oct 2007
Location: United Kingdom
Cold weather can show up defects in batteries, like a dead cell. When reconnecting up the battery make sure that the ignition is OFF, even better have the key with you, because most alarms will rearm automatically when reconnecting the battery up. Also keep a door or window open, just incase something weird happens, like door locks by itself.
Once you get up & running, take your car to a motor factors or Halfords and ask for a Battery Load check as this can/will show how good your battery is.