TC200-EX-i Two-Position Battery Charger for Sony BP-U Series features two integrated battery plates supporting Sony and non-OEM BP-U30 and BP-U60 batteries. It's capable of charging two batteries simultaneously and charges a typical 56Wh battery in about 4 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.