CasePower A55 Lithium Polymer (LiPo) 2500mAh Silver,Stainless steel

Mini Power Booster, micro USB, Li-pol 2500mAh Mini Power Booster is a stylish rechargeable 2500mAh battery in a super-thin finish. It is the size of a credit card powered with 2500mAh, enough to give a full charge to an iPhone and approximately 70-80% charge to a smartphone.

-Emergency power to keep in your wallet, pocket or bag
-Super-thin and compact design
-Durable – made from steel
-90-100% extra charge for iPhone 5/4S/4
-70-80% extra charge for Android smartphones
-Extended talk time by up to 4-6 hours