What ONT do I have and where can I obtain a battery backup?
I recently had AT&T Fiber Internet installed. The tech installed what I believe to be an ONT (based on random Googling) in my crawl space with the router inside. Although it has a battery compartment, no battery was installed. Although I have a UPS on the router, I lose internet access whenever the power goes out. Other Google results seem to indicate that AT&T no longer provides batteries, so I'm trying to figure out where to buy one myself.
The only sticker on the ONT contains the following:
ALU P/N: 3EM22993ABBA MRev02 ICS01
DELTA P/N: GES320W12V0081 REV: 05
(and a serial number, which isn't really relevant)
I chatted with AT&T support, who told me my ONT is a G-240G-A. However, none of the pictures I'm seeing online for that model look anything like what I have. She also gave me a phone number to call, saying they would help me order a battery. The phone number (866-539-5791) ended up being Belkin support, who said they ended their contract with AT&T and no longer manufacture devices for them.
If anybody can point me in the right direction, it would be much appreciated. If nothing else, maybe some of you have suggestions for an external UPS that would work okay in a crawl space.