I bought an 2005 EZGO electric golf cart today. Batteries are 4 months old, but ran completely out of juice. When I plug in the battery charger in it doesn't turn on. I tried another charger "same as one i got with cart" and it wont kick on either. Do the batteries need to have enough voltage in them to tell the charger to charge? If so what do you recommend I do to get it charging? If no, what the heck do i do with it now?