Bought a used maxabeam, need help for powering



Hello, bought one on ebay, arrived, how do i know what generation it is?
Model MBS 410 Serialnr: M10331G220

Can i power it with a 3S2P lithium power pack that i use for model cars? Or do i need 12Vdc lead accu?
Also, i dont have a connecting cable, so i need to know witch 2 pins are + and - of the 4 pins?

Thanks marc