TC200-SON-i Two-Position Battery Charger for Sony L-Series features two integrated battery plates supporting Sony and non-OEM NP-F770, NP-F970, and NP-F975 L-Series batteries. It's capable of charging two batteries simultaneously and charges a typical 5600mAh battery in about 3.5 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.