The UC-90 Battery Charger for Tough TG-1 iHS Cameras from Olympus is a replacement or backup charger for the LI-90B lithium-ion battery. This is the battery that comes included with, and powers, the Tough TG-1 iHS camera. The charger uses a USB 2.0 plug, and has a built-in LED indicator. The LED turns on while charging, off when it is charged, and blinks when an error is detected.