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I am having a similar issue. BE650G. A plug test is almost nearly always successful, but it shuts off randomly after a few weeks, even though there is no power event and the battery has 100% charge. Every so often (sometimes multiple times a day), I will also hear a faint "chirp" come from the UPS, as if it's about to start beeping at me but then is interrupted from doing so. There is no other sign of a brownout. (It has a BE450G next to it that is working perfectly and has none of these symptoms.)
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I recently unplugged it, and then tried to turn it on and have it run off of battery with no load (with the battery at 100% charge). This worked. But then I started moving the UPS around physically while it was on, and found that if I tilted it on its side or turned it upside-down, it would shut off. It would fail to turn back on until I lightly shook the unit, at which point it would start operating normally again. Whenever I shake it or reorient it (put it on its side, turn it upside-down, etc.), I do hear something loose in there that is knocking around a bit. I suspect there is a physical manufacturing defect. Others who are having this issue might try similar tests.
-- Nathan
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