He goes on to connect several router ... UPS unit [Gadget Addict] was using has a lead acid battery that was prone to failure on an almost annual basis — which defeats the purpose of a backup ...

Oh, good, you’re still here ... you’ve lost data because of a sudden power outage, you know just how annoying and dangerous that can be. A UPS is a backup battery, giving you precious time ...

The Home Internet Backup plan includes free equipment starting at $20 monthly or $10 for T-Mobile voice customers. You will need power to the T-Mobile router ... As for a UPS, or uninterruptible ...

[TechRally] takes advantage of this to create an automatic DC UPS with dual outputs to power a router and modem in the event of a power outage. You can see two videos about the project below.