Stop in for a cup of coffee

I will need to add my own back up power for the modem if I switch to a VOIP.
But it at least it will be a real backup; unlike what Verizon offered me - a pack of 12 D cell batteries.:mad:
They've insisted switching phone to Fios would be exactly the same as plain old telephone service.
except I have to provide a power outlet for their box,
and I need to stick these batteries in a the backup power device and plug it into the interface box if power goes out.
:rolleyes:
ps. non-rechargeable D-cells can't be used, and the back deveice can't be left on when there is no outage or it will drain.