Amazon.com: Luxtude Portable Phone Charger Built-in Wall Plug, 10000mAh Power Bank with Cables【iPhone Lightning & USB C & Micro】, Travel Fast Charge External Battery Pack for iPhone, iPad, Android, Samsung etc. :
Lithium Ion Battery Pack - 10Ah (3A/1A USB Ports) - PRT-15593 - SparkFun Electronics
Etokfoks 12000mAh Silver Portable Charger with Dual USB Ports 3.1A Output Power Bank Ultra-Compact External Battery Pack MLSA11LT029 - The Home Depot