Most Powerful Portable Charger: RAVPower 16000mAh External Battery Pack Power Bank with iSmart Technology – REVIEW

4.5A Output: Highest output in the market, featuring a 4.5A total output capable of simultaneously charging 2 tablets, making it faster and more powerful than the rest.
Exclusive iSmart Technology: Charge faster and smarter than others, automatically detects and delivers the optimal charging current for any connected device- ensuring the fastest and most efficient charge.
Huge capacity: 16000mAh charges an iPhone 6 almost 6 times, a Galaxy S6 almost 4 times or an iPad Air once.Safely recharges with a 2 amp or higher output charger (most phone chargers have only 1 amp).
Unique Design: Smooth, ebony varnish allows you to power up in style, while 4 status LEDs keep you informed of remaining capacity. Built-in flashlight for dark or low-light environments.
Safety Protection: Ultra reliable A+ Lithium-Ion battery with over 500 battery charge cycles; Security protection design: short-circuit and over-current protection. This battery pack will automatic shutdown if a short circuit or overload output occurred while unit is charging.