Borrow power bank / battery pack

Anker 26800mAh power bank Information from manufacturer: Anker Power Bank, PowerCore 26800mAh Portable Charger with Dual Input Port and Double-Speed Recharging, 3 USB Ports External Battery for iPhone, iPad, Galaxy, Android and Other Smart Devices Colossal Capacity: 26800mAh of power charges most phones over 6 times, tablets at least 2 times and any other USB device multiple times. High-Speed Charging: 3 USB output ports equipped with Anker's PowerIQ and VoltageBoost technology ensure high-speed charging for three devices—simultaneously (max output 6A, single-port max output 3A). Recharge 2X Faster: Dual Micro USB (20W) input offers recharge speeds up to twice as fast as standard power banks—a full recharge takes just over 6 hours while using both input ports (wall charger not included).