And Man did that make a difference. The Cart is a 36 volt system and all the info I could come up with said that the marine batteries wouldn't hold up to the draw of the golf cart. WELL, I tried it anyway. I am amazed that My daughter and I rode on the cart for at least 2-1/2 hours and the batteries still showed a full charge even under power, and is better and lighter than the 6v batteries that is supposed to be used. Plus these were half the price of the 6v stockers. I AM a genius.