said by mark_e:
When I added a 3rd phone line, my ONT was swapped and a GIANT (14" x 24") power supply installed. There are 4 batteries with space for 4 more.
Which leads me to 2 questions:
1) Will I be responsible for replacing all 4 when time claims their life? (I would guess YES)
2) For the VZ techs, will installing 4 more batteries double the run time and/or keep the data service up?
The only good news is that there's a switch to turn the audible alarm on and off!
If it's the same size batteries as the smaller BBU, they are very inexpensive. Around $14 each online. Since they are the same batteries my APC backups use. I get them in pairs for around $28 a pair. Last year I replaced a couple dozen of the APC batteries in my UPSs. And I also replaced my BBU battery. But when the FiOS power supply died, they replaced the power supply and put a new BBU in as well with a new battery so I got my battery back.
But I also have the FiOS BBU connected to my own UPS which gives me 16 to 18 hours of runtime before the ONT BBU will have to use it's own battery. I could remove the battery from the ONT BBU but I see no point since the batteries are so inexpensive. The last battery lasted five years. So $14 over five years is only 23 cents a month. If people can't afford that then they really should not even have cable TV or internet service.