Running a DSL Router From a 12v Battery (Anti-Loadshedding DSL) : 4 Steps (with Pictures) - Instructables
Amazon.com: Mini UPS Battery Backup 10400mAh 38.48Wh,Output USB 5V/2A and DC 12V/2A,Home Small UPS Power Supply for WiFi Router Phone Camera : Electronics
Netgear Nighthawk AX12 12-Stream MU-MIMO Wi-Fi 6 Router | P.C. Richard & Son
RouterBuddy GO: Vehicle Power Adaptor for 12V WiFi Routers – Circuit Desk
DC Mini UPS 5V/9V/12V/15/24 6 outputs WiFi Router/Smartphone/CCTV/IP Telephone | eBay