The 12V 2.3Ah rechargeable Ni-MH battery pack comes with a smart charger, featuring a Hi-Lo switch, enabling you to quick-charge the battery pack in an hour. That's great if you only have one battery to recharge. Having multiple batteries requires multiple chargers. If you're serious about filming all you can on a dive trip don't be caught with dead batteries. Having spare fresh charged batteries can make the difference between getting that spectacular footage or just watching the event pass by and left only to memory. Share all the memories of your spectacular dives.