Anker 337 Power Bank (PowerCore 26K) Portable Charger, 26800mAh External Battery with Dual Input Port and Double-Speed Recharging, 3 USB Ports for iPhone, iPad, Samsung, Android and Other Devices

Colossal Cell Capacity: 26,800mAh of power charges most phones over 6 times, tablets at least 2 times, and any other USB device multiple times.
Charge 3 Devices at Once: 3 USB output ports together with Anker’s PowerIQ and Voltage Boost technology ensure charging for three devices simultaneously (not compatible with Qualcomm Quick Charge).
Recharge with Dual 20W Micro USB: A full recharge of the power bank takes just over 6 hours while using both input ports (wall charger not included).