I am in the process of a tank build. I am also building a backup power and a frag tank. These batteries are Lithium LiFePO4 3.2 Vdc at 60ah each. It is two batteries wired in parallel than in series to get me 24 Vdc at 120 ah. I have an inverter/charger to charge the batteries and convert dc to ac. I plan on getting rid of all of the brick power supplies and running off the batteries where I can. More to come.