Chargers need to be carefully chosen as you need to have the optimal charging Algorithm for your particular pack of batteries whether you are using AGM, Gel, Flooded SLA, Ni-Cad, NiMH, Lithium or any other rechargeable battery that may come on to the market in the future. If you do not have the correct charger/battery combo than you can greatly decrease the life of your battery or cause other damage.