I received my PPM yesterday, and updated to the latest firmware and switched to presentation mode. I had it plugged in, but didn’t realize that it was using battery, and it subsequently ran the battery down. I didn’t get a low-power warning, it just shut off.
I then checked the connections and eventually, the red charging light came on. So I turned it back on and confirmed that the charging indicator was also shown on screen. I started watching Netflix, and after about 20 minutes, it shut off again.
I checked the projector and the charging light was off. So I switched the mains off, then back on, and it turned red again. I turned the projector back on and, once again, verified that the charging indicator was shown. I started watching Netflix again, and after maybe 5 minutes, I noticed that the charging light had turned blue. Sure enough, after a few minutes the projector shut down. It wasn’t blinking red/blue, so it doesn’t seem to be a power supply issue. But, even if it thought it was fully charged, it should still be drawing power from the mains, and not run the battery down.
I’m using the power supply and cable that came with the unit, and it’s plugged into a power strip.