Anker PowerCore 26800mAh Portable Charger

While it's not the cheapest on the market, the Anker PowerCore 26800mAh Portable Charger is your best bet for portable chargers if you want maximum power. It can charge most phones 7 times and tablets 2 times. This means you could travel with it and charge your phone for a week! It includes 3 USB ports so everyone can charge at once.

Get it on Amazon for $59.99.