We have a golf cart (Cushman Hawk) that runs on eight (8) 6volt batteries that are in series. The total system voltage is 48v (8x6). The batteries need to be replaced but are very expensive at $250 a bettery. Theoretically, can I use four (4) 12v auto batteries and still achieve the same results with out harming the system? Will the charging system be destroyed or interferred with?