I found these batteries in the shop. Very surprised that they are cranked up to 12V, but these should work...?
http://www.clasohlson.com/se/Alkalis...-V23GA/22-3226
http://www.clasohlson.com/se/Alkalis...a-V27A/36-5217
Then just a wire from the battery's + pole to pin 2 and - pole to pin 1 to the lock terminal?
Sorry if Im being stupid... (not much of an electrician, should maybe what for the replacement wiring harness
)