I ddin't know (but should have guessed) you can get battery chargers that work in the car...
Roy ..I seen them on ebay.. Only seems to be one type that ya can use in car and its same as yours.. BUY NOW 24 quid... Sound about right to you? Ya get x4 2100
http://cgi.ebay.co.uk/ws/eBayISAPI.d...category=15202
Or was yours cheaper?