What we bought: Anker's MagSafe battery pack charges and pulls double duty as a phone stand | Engadget
Anker 521 PowerHouse—Power Your Next Trip - Anker US
Power Banks - Anker US
Anker Power House Portable silent inverter battery 110V Outdoor JP | eBay
Anker Power Bank, 325 Portable Charger (PowerCore Essential 20K) 20000mAh Battery Pack with High-Speed PowerIQ Technology and USB-C (Input Only) for iPhone, Samsung Galaxy, and More: Amazon.co.uk: Electronics & Photo
Anker 760 Portable Power Station Expansion Battery