Items used:
https://roypowcell.com/products/roypow-12v-18ah-lithium-iron-phosphate-deep-cycle-rechargeable-battery
RoyPow LiFePO4 12 Volt Lithium battery -  https://amzn.to/3A9y9WA
12 Volt Regulator - https://amzn.to/3QuCicP
Inline Fuse assortment - https://amzn.to/3zL23yY

This video is how to make a long lasting Uninterrupted Power Supply for your WiFi Router. This will allow your laptops, phones, and other battery powered devices stay connected to Wifi when you power goes out.