CasePower A29 Lithium Polymer (LiPo) 850mAh Black

Credit Card Power Booster, 800 mAh, 50g The Credit Card Booster is a stylish rechargeable 850mAh battery in a super-thin finish. It provides an extra boost of battery time just when you need it. Keep the pouch with battery in your bag or pocket and stay powered with your smartphone at all times. It has a built-in micro USB connector to charge most smartphones.

-Emergency power to keep in your wallet, pocket or bag
-Built-in micro USB cable for easy charging on-the-go
-Gives you approximately 25-30% extra charge for a smartphone
-Extended talk time by up to 1-2 hours