No More Running Out For Batteries, Your 4Patriots USB-Rechargeable AA Batteries are designed to keep your important devices powered. The 1,200 mAh lithium polymer battery recharges up to 500 cycles. And it can recharge at any USB port. No large charging bricks needed. Every 4Patriots USB AA order comes with 4 rechargeable batteries. They "fast charge" in as little as 2 hours depending on charging conditions. Charge them up at your computer. Or use your 4Patriots Patriot Power Cell to charge them on the go. You won't need to dump hundreds of single-use batteries into landfills either. Just recharge & go. That makes them a great source of green energy.