I have the same issue. I set power life saver in windows to 80% and my battery 
always reports discharging. Even when I'm in AC mode
antib...@neptunus:/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0A:00/power_supply/BAT0$
 cat uevent 
POWER_SUPPLY_NAME=BAT0
POWER_SUPPLY_TYPE=Battery
POWER_SUPPLY_STATUS=Discharging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=120210000
POWER_SUPPLY_VOLTAGE_NOW=-1000
POWER_SUPPLY_CURRENT_NOW=0
POWER_SUPPLY_POWER_NOW=0
POWER_SUPPLY_ENERGY_FULL_DESIGN=50610000
POWER_SUPPLY_ENERGY_FULL=50610000
POWER_SUPPLY_ENERGY_NOW=40480000
POWER_SUPPLY_MODEL_NAME=
POWER_SUPPLY_MANUFACTURER=Sony Corp.
POWER_SUPPLY_SERIAL_NUMBER=

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acpi reports battery 78% charged when battery fully charged
https://bugs.launchpad.net/bugs/177963
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