Hi Filark,

Yes, it runs while plugged in. When plugged in near the "spine" of the PE, the little green light blinks. I can use the PE while it's plugged in, but when I pull the plug out the light stops blinking and the PE turns off in less than 10 seconds. I confirm that it's actually off by clicking the menu button and there's no response.

I'll keep it plugged in overnight and see if anything happens. Thanks for checking in, Filark!