Energio 3850mAh Slim External Battery Pack with Built-in Micro-USB Cable and Lightning Adapter for Smartphones - Silver Sleek and sturdy light-weight aluminium shell with silver finish. Smaller than your cellphone&nbsp;&nbsp;and so slim that it can fit in the same pocket with your phone. (4.21 x 2.64 x 0.33 inches, 3.8 ounces) High grade lithium polymer battery gives a full charge on medium sized phones such the iPhone 6, Samsung Galaxy S6, LG Nexus 6. Over 500 cycles of charging. Clutter-free charging with built-in micro-USB charging cable that is hidden away when not in use. No more messing with tangled cables. Fast and safe charging with built-in software that regulates temperature, voltage and current. Maximum output of 5V/1.5A that gives a faster charge than other portable chargers of similar sizes. Apple lightning adapter included to charge the latest Apple devices such as the iPhone 5 and 6 models. One Year Full Warranty that replaces all defective products with a new working battery charger.