Never in the history of time has it been easier to recharge your batteries. With these USB Rechargable Batteries all you have to do is plug them up into a USB port and then 5 hours later they are ready to go! Stop wasting money on batteries you have to throw away once they run out of juice. Save some money, be less wasteful and embrace technological breakthroughs. The USBCELL AA Rechargeable batteries can be recharged hundreds of times and can be used in anything that takes AA batteries.