The RAVPower external charger offers a whopping 14,000 mAH of battery power for you on the road. That is enough to charge your device up to 5-7 times. The Super-fast charge output (5V / 3A total) through dual USB ports (5V / 2A and 5V / 1A) allow for simultaneous charging of your Android phones & tablets. This isn’t some cheap chinese battery, the internal battery is a Samsung Lithium-Ion battery with over 500 battery charge cycles. For added security the battery pack will automatically shutdown if a short circuit or overload output occurs while the unit is charging.