Like other customers, I was really surprised to find that we can only order ONT battery backups when beginning service or at the time of installation. The sales rep I spoke with was sympathetic, suggesting that maybe I could find the Powertec Solutions PS18L-32 for sale via an online retailer. As above, no dice.
Sonic could really do better here. With so many of us working and learning from home in these long, hot, unpredictable days of summer, the availability of post-install ordering for these feels necessary.