hi, got my shurflo new backpack, and i am very pleased with it, the only thing that troubles me is the charger has no led light on it to indicate that its fully charged, are those 12v 7amp batterys inteligent, i mean they cannot over charge, am i correct. am sure jeff said it was, my email is down, and i cant reach jeff to ask him this question, if its not an inteligent battery, how long do i charge it for, also it may even be fully charge when it was delivered, i dont know for sure, any ideas anyone