Dave. Please tell me you did a Google search for yourself before posting here. Please.
In only ask because I did just that and this was the very first result
http://www.ebay.co.uk/bhp/worx-battery-charger
Its unlikely you'll be able to find one new; these are Chinese (or similar) pile 'em high and sell 'em cheap items with a store specific label stuck on and no (or next to none) support..
Anon
July 2016