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Introducing the Eco Battery, the worlds 1st micro USB fast-charge recharging battery, thats efficient, quick and easy to recharge. With its high power capacity it will recharge up to 500 times with supplied twin micro-USB charging cable designed to charge two batteries simultaneously. Each battery has an LED indicator ? red while charging, changing to blue when fully charged. Say goodbye to bulky and unsightly plug-in chargers and power up your devices using efficient eco rechargeable batteries. 1.2V Ni-MH. In Packs of 4, AA - 1000mAh and AAA - 450mAh. | Easylife Usb Rechargeable Eco Aa Batteries, Size Pack Of 4 Selling Fast!