Dolgin TC400PANBLJ Four-Position Battery Charger features four integrated battery plates supporting Panasonic and non-OEM batteries. It's capable of charging four batteries simultaneously and charges a typical 3,050 mAh battery in about 2.5 hours. As the battery is being charged, a diagnostics LCD displays status in volts, amp hours, and percentage of charge. The percentage of charge is estimated using a proprietary algorithm.