Features:

Easy to Recharge: Simply open the cap on the battery, and plug into any USB port.
Charge Anywhere: Charging cords are not needed, just plug directly into an USB computer port, wall block, battery pack, etc.
Charging Light: Red light indicates battery is charging, Blue light when its fully charged.
Save Money: Each battery gives you over 500 charges, saving hundreds of dollars.
 

Make It Easier:

Add a 4-Port USB Charger to your order, and you can charge 4 batteries at once!
Don’t waste your money on single-use batteries that could let you down during an emergency. Pick up a few packs of durable and long-lasting EasyPower USB Rechargeable Batteries today.

Specs:

Battery Type: AA Rechargeable USB, NiMH
Includes: Plastic Carrying Case 
Input Source: USB
Capacity: 1450mAh
Compatibility: USB 2.0 and USB 1.1
Weight: 3.1 oz (4 batteries with case)
Strength: 1.2 Volts