Rechargeable batteries have a lower capacity than disposable alkaline batteries .
It's best to recharge batteries slowly. A battery with a capacity of 2,800 mAh can deliver a current of 2,800 mA for an hour Rechargeable batteries have a lower capacity than disposable alkaline batteries. This really depends on what you are using the batteries for. For most high drain electronic devices, like digital cameras, rechargeable batteries will continue to work much longer than alkaline batteries. In fact in devices like digital cameras, NiMH batteries will run on a single charge for 3-4 times as long as they would on an alkaline battery.