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Power Smart Rechargeable 9V 1200mAh Lithium-ion Battery HF9. It is micro Usb charged. It can be charged by any USB 5V output like a cellphone charger. It has a steady 8.4V to 6V discharge voltage. This battery can only recharge to 8.4V. Please note: If your device requires standard 9V or higher voltage please buy Alkaline 9V Battery.