Power Bank, 2500mAh Ultra-Thin Portable Credit Card Sized Battery Cell Phone Charger, All Connectors, USB Charge Wire, MicroUSB, iPhone 4/5/6, Samsung Galaxy S5/S6 -Guaranteed  (Dachshund Dog Gift) Wallet sized 2500 maH portable charger for most Apple iPhone and Android products. All connectors and charge wires included! Easily fits in pocket or wallet. Conveniently recharges your smartphone. LED display shows battery life and level of charge. Solid blue light when fully charged. 4 quick flashes reduces to 1 flash while battery discharges. Tested power capacity results from USA. 1474 maH measured which translates to the 2500Mah as advertised. Let me explain the science. All Lithium polymer batteries are fully charged at 3.7V. Most smartphones charge at 5V. To convert to 5V, this equals 74% drop in maH. (3.7V/5V=74%). 74% of 2500maH = 1850 maH. High quality power banks will also run at 75-83% efficiency due to heat loss and resistance. This device is measured at 80%. (1474 maH (as measured) / 1850 maH (maximum possible)= 80%. This device is a high quality tested 2500maH power bank. Beware of untested competitors. 100% Money Back Warranty and 100% Customer Satisfaction Guaranteed