Amazon.com: 4G LTE Mobile Hotspot 5200mAh Portable Charger Power Bank, Mini Mobile Router with Travel Power Bank Support WiFi Hotspots Auto Establishment, Mobile Power Bank&Pocket WiFi, Only Supported in Europe : Electronics
Amazon.com: TP-Link N300 Wireless Portable Nano Travel Router(TL-WR802N) - WiFi Bridge/Range Extender/Access Point/Client Modes, Mobile in Pocket : Electronics
Amazon.com: 4G LTE Mobile Hotspot 5200mAh Portable Charger Power Bank, Mini Mobile Router with Travel Power Bank Support WiFi Hotspots Auto Establishment, Mobile Power Bank&Pocket WiFi, Only Supported in Europe : Electronics
Amazon.com: TP-Link AC750 Wireless Portable Nano Travel Router(TL-WR902AC) - Support Multiple Modes, WiFi Router/Hotspot/Bridge/Range Extender/Access Point/Client Modes, Dual Band WiFi, 1 USB 2.0 Port : Everything Else
DIY Mini UPS for WiFi Router / Modem : 12 Steps (with Pictures) - Instructables