GP ECO E211 + 2XAA RECYKO 2100 with Charger is a Ni-MH rechargeable battery from GP Batteries, suitable for AA,AAA,R03,R6 batteries. The charger features overcharge protection which eliminates the risk of overheating and ensures the safety of the battery. It has a USB port allowing users to recharge the battery from the USB cable, and an LCD screen to display the battery's charging status. In addition, the charger is easy to use, just connect it to a power source and it will detect the best charging rate for the battery. It also has a standby mode to save power when not in use.