The SL-F50 is a battery replacement solution for equipment and accessories using the Sony L-Series batteries. Battery features 4 LED power status indicators, X-Tap output port, and USB output port. The X-Tap port is designed to both charge the battery and to power 7V accessories (X-Tap charger, LC-XT1, is necessary to charge via the X-Tap port). * X-Tap is different from the D-Tap.