testing a kernel with teh above patch doesnt seem to fix it either ...
but i made an intresting observation:

right after first boot
ogra@nexus7:~$ upower -d |grep energy-full:
    energy-full:         73.66 Wh

the "energy-full" value actually should be a fixed value coming from the
battery describing the upper charge level...

after a reboot:

ogra@nexus7:~$ upower -d |grep energy-full:
    energy-full:         69.42 Wh

and indeed the battery applet (with "show time" set in the options)
immediately show 100% charge at boot (even though thats nonsense indeed)

so i think our base value used to compute the time in upower is reported
wrongly (or read wrongly by upower)

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https://bugs.launchpad.net/bugs/1093543

Title:
  Battery status behaves erratically

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