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Operation 1.Charge Li-ion Battery Connecting power supply and inserting batteries, it will automatically start charging. Inserting one battery, the charge current will be 2A. Inserting two batteries, the charge current will be 1A for each channel. When the power (or voltage) of battery is different, the charger will charge the lower one, then charge two batteries together. In case that one battery charges the other one, or battery over-charge and over-discharge. 2.Charge Li-ion Battery and USB Device at the Same Time The charger will charge USB device prior to batteries when charge together. The external device charges directly from the power supply instead of batteries, to reduce the cycle of battery and extend battery lifespan. 3.USB Output Function Insert one or two batteries, and connect USB device, the charger will automatically charge the external USB device. The max output of two batteries is 2A, the max output of one battery is 1A. When the power (or voltage) of battery is different, the charger will discharge the higher one, then discharge two batteries together. In case that one battery charges the other one, or battery over-charge and over-discharge.