DIY - UPS for the router - Team-BHP
Mini UPS Router Optical Cat Adapter Uninterruptible Power Supply DC Backup Power Supply AC 85-265V to DC 5V 9V 12V 15V 24V - AliExpress
DIY Mini UPS for WiFi Router / Modem : 12 Steps (with Pictures) - Instructables
DIY Mini UPS for WiFi Router V2.0 : 20 Steps (with Pictures) - Instructables
DIY - 12V Mini UPS
Luminous Mini UPS LMU1202, 15W/12V, Micro DC UPS for Wifi Modem & Router at Rs 1650/piece, Mini Uninterruptible Power Supply in New Delhi
Make a 12v mini UPS for my Wi-fi Router _ Upto 5Hrs Backup
UPS FX 5-12 Mini UPS Uninterruptible Power Supply, 220VOLT (NOT FOR USA)
DIY Mini UPS for WiFi Router V5.0 : 18 Steps (with Pictures) - Instructables
Advitiya - DIY Kit for Mini UPS for WiFi Router/Modem With TP4056 Charger, Boost Converter, LEDs, DC Jack-Male, Rocker Switch, Battery, Battery Holder, Enclosure : : Industrial & Scientific
DIY Mini 12v Router UPS malfunction Electronics Forum (Circuits, Projects and Microcontrollers)
DIY - 12V Mini UPS using 18650 batteries maybe already posted : r/18650masterrace