Most portable electronic devices require two batteries to operate. Therefore, we always suggest choosing a rechargeable battery charger with more than one independent charging channels. At BatteryDivision, there’re battery chargers that come with up to 2 charging channels. From the most basic and economical to the most high-end, some of the units can work with a number of battery types including Lithium Ion, and NiMH for as long as it lasts. If you have just a couple of batteries that are constantly used, consider a 2-slot charger as one of your selections.