I have a ATT36A12V3S Cyberpower ONT battery backup PSU that has never included a battery, as ATT omitted it when first installed since I didn't have phone service (or that's what the tech said, anyway).
After recent power outages in my area, I decided to buy and install a battery myself, but when I opened the ONT PSU, I was annoyed to see the battery harness wasn't included. Replacement batteries (including OEM) are easy to find, but I can't find details about the harness itself. I'm specifically referring to item #3 on page 6 of the manual here: https://www.att.com/support_media/images/pdf/phone/CyberPower_PSU.pdf
Does anyone know the part number for a compatible harness and where to get one?
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