I just bought the Stanley Fat Max tool box for my field equipment. Can't decide on using a deep cycle marine battery or a jumpstarter for charing my LiPo batteries( 3S 4000mah & some 5S 5000mah). The weight of the marine battery worries me as far as the box holding up to constant use. Are jumpstarters sufficient for what I want to charge. I know they are only 18-22Ahr but they weigh less & have built in charger to replenish the battery & the marine battery would probably be 50-75Ahr. What do you guys use in your boxes & are you concerned about the tool box holding up. I'm using a Triton2 & icharger 208B for chrarging my batteries. Really need your advice guys.