These Amish do practice safety-oriented buggy markings within what is religiously acceptable, namely, reflective tape along the perimeter, reflective materials on wheels, and side-mounted lanterns.

I have a (refurbished) APC Back-UPS LS 500 I've been using for a year and a half or so, and recently when the power's been crappy (thanks to bad drivers...) I've noticed it's no longer doing the thing ...

From your description it would seem that the battery is not the problem, and because the light is flashing on and off, I would be looking for a loose connection. Disclaimer: You acknowledge and agree ...