When battery capacity insufficiency, takes down the battery the nearcathode black To be partial, reveals the battery the USB connection, inserts the computer the USB already to be possible to charge, duration of charging 4 hours.

USB Battery with your logo and OEM packing.

Detailed Description:

1)Rechargeable AA batteries
2)Charge by USB Port and traditional charger
3)Widely used as common AA battery in your MP3, DC, DA, controller, PDA, PMP, PSP etc.
4)Packing: 2pcs/blister card
5)Ideal for both resell and promotional gifts.