I bought a mini-ups for our gateway and WAP but found that during power outages we do not have internet access. The ONT is on the outside of the garage. Upstairs in the bonus room is a distribution box for alarm, ethernet, coax, etc. There is an AT&T battery box adjacent. It is plugged into an AC receptacle in the distribution box. I assume this sends 12v back out to the ONT. We were told we do not need a battery here because that is for traditional phone backup, which we have never had.
Is this true, or do we need that battery? Would it power the ONT in an outage? If not, what is the best way to provide backup power to the ONT? Another mini UPS just for upstairs?