hi you have got 12v lead acid batterys it looks like 3 ? =36volts. look on ebay or on line for a lead acid 36v charger. you probably wont find one with the same connection as the one your holding in pic so i would go for the sort with kettle socket and get a plug to match ebay? then connect 2 wires to the plug then connect the red and black to the same red and black as the socket in your pic thus you dont have to cut off the plug in pic. or until you get one any 12v car charger will be fine but you will have to charge them all individually probably about 2to 3hrs each batt from dead. hope this helps. cheers crimsonsnake