Created attachment 673047 [details]
Screenshot

Before that it goes all sorts of crazy. A rundown of what happens here:

1. Let battery run down until it starts to show the notification the "Computer
will hibernate unless plugged in" (note the "hibernate" there?)
2. Ignore the notification
3. Keep running the laptop on battery power; for the really impatient folks,
have your firefox start playing a flash video ;)
4. Strange things start to happen after a while:
   - The battery icon in the top-bar disappears and is replaced by a shutdown
icon. Any mention of the battery also disappears from the power panel in
gnome-control-center (Attached screenshot shows this).
   - The notification saying "Computer will hibernate soon..." starts to appear
and disappear randomly and intermittently.
   - gnome-power-statistics crashes, coredumps.
5. After a while computer halts abruptly. The battery is now completely out of
juice.

I don't have any special set-up going on here. Just installed a TW (20160411)
on a brand new computer and fresh home dir. Tested also on an older laptop,
with identical results, so doesn't seem a one-off hardware thing either.