The GP Recharge B441 AA / AAA USB Battery Charger is a versatile charger, working directly via USB to charge batteries wherever you are. Charge 2 or 4 AA or AAA batteries to save money over time and reduce battery waste.. Overheat Protection. Monitors battery temperature and cuts off power when it exceeds a safe value.. Auto Cut-off. Power cuts off when fully charged or overheated, saves energy and extends battery life.. Specifications. Dimensions: Approx.85 (L) x 75(W) x 25(H)mm. Weight: Approx.160g. No. of slots / Channels: 4 / 2. 2 LED indicator:. Green LED ON for 0.5 second after just USB power input. Charging in progress – Green LED slow flashing. Fully charged – Green LED ON. Bad/Single-use Batteries inserted – Green LED fast flash. Output Voltage / Charging Current:. DC 2.8V ⎓ 770mA x 1 (for 2pcs AA size). DC 2.8V ⎓ 380mA x 2 (for 4pc AA size). DC 2.8V ⎓ 300mA x 1 (for 2pc AAA size). DC 2.8V ⎓ 300mA x 2 (for 4pc AAA size). USB power input: D.C. 5V / 1A. Charge time* (input D.C. 5.0V 1.0A min., 2pcs of batteries):. 1300 - 2600mAh AA battery - About 2 – 4 hrs.. 850mAh AAA battery - About 2.5 – 3.5 hrs.. Safety protection:. Auto power cuts off when fully charged. *Charging time varies with battery capacity