ELECTRIC GO CART HACK

I bought this go cart used with no battery's or charger. its runs from 12 to 24 volts, so i took my RYOBI 18 volt  flash light apart and hooked it to the wires that went to the battery. i have a bunch of these batterys so the fun never stops, cause there is always a couple on charge. also it did not have reverse, so i wired in a toggle switch to control the direction.