TC200-CAN-BP-827-i Two-Position Battery Charger for Canon BP-800 Series features two integrated battery plates supporting Canon and non-OEM BP-827, BP-828, BP-819, and BP-820 batteries. It's capable of charging two batteries simultaneously and charges a typical 2670mAh battery in about 3 hours. As a 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. An auto-detecting USB port is available for charging phones, tablets, and other USB devices; it works when the charger is plugged into AC power as well as on-the-go off of an attached battery.