Similar effect on my machine:

The ThinkPad x61s is running ubuntu 11.04. The upowerd (0.9.9-4) shows
sometimes a wrong energy-full value after wake up from standby:

upower --monitor-detail
Monitoring activity from the power daemon. Press Ctrl+C to cancel.
[14:46:10.037]  device changed:     /org/freedesktop/UPower/devices/battery_BAT0
  native-path:          
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:01/PNP0C09:00/PNP0C0A:00/power_supply/BAT0
  vendor:               SANYO
  model:                92P1003
  serial:               804
  power supply:         yes
  updated:              Sun Jun 12 14:46:09 2011 (1 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               discharging
    energy:              10.16 Wh
    energy-empty:        0 Wh
    energy-full:         166.08 Wh
    energy-full-design:  63.36 Wh
    energy-rate:         11.691 W
    voltage:             13.82 V
    time to empty:       52.1 minutes
    percentage:          6.11753%
    capacity:            98.6742%
    technology:          lithium-ion
  History (charge):
    1307882769  6.118   discharging
    1307882739  6.190   discharging
    1307882709  6.274   discharging
    1307882679  6.334   discharging
  History (rate):
    1307882769  11.691  discharging
    1307882740  13.400  discharging
    1307882710  12.879  discharging
    1307882679  13.064  discharging

Workaround: As mentioned already, restart the upowerd after wake up
seems to help.

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https://bugs.launchpad.net/bugs/770881

Title:
  upower shows wrong battery percentage after waking up from suspend

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