You'll never have to set charge preferences for a Spektrum Smart battery until you want to. When the 8.4V 3300mAH NiMH Smart battery is connected to a Smart charger, unique parameters and health of that battery upload from the Smart memory microchip integrated into the battery. The 3300mAh Smart NiMH battery is factory assembled with the next-generation IC3 output connector conveniently compatible with older devices equipped with robust EC3™ and connectors. When connected to a Spektrum Smart device, all the benefits of Smart technology become obvious. Spektrum Smart NiMH batteries also maintain an error log including the number of over-heat, over-discharge and over-charge incidents which can be helpful data in assuring that the battery you've chosen is right for the application.