Mouse battery percentage on 10.8.2 not equal to OS reported capacity

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What steps will reproduce the problem?
1. Start BtBatStat on 10.8.2
2. Note battery% from the app and from the OS


What is the expected output? What do you see instead?

The app shows results that are different from the OS.

What version of the product are you using? On what operating system?

0.9 on 10.8.2

Please provide any additional information below.


I'm running 10.8.2 and see the following:
- keyboard % is correct
- mouse % is shown as 61% while OSX itself shows it as 100%

I tried a different mouse (Logitech bluetooth mouse) and it is not detected, so 
the issue is with this (Magic) mouse only.
I reconnected the mouse and it dropped to 60%.

Not saying BtBatStat is incorrect, it is just different. Here is the result 
from my freshly-loaded rechargeables:

ioreg -n BNBMouseDevice |grep -i perc
      |   |   |   "ExtendedFeatures" = {"SuperMode"={"size"=1,"id"=215,"min"=0,"max"=1,"type"=2},"FullFactoryDefault"={"id"=68,"type"=2},"DeviceNameChange"={"id"=80,"type"=2},"DeviceName1"={"id"=81,"size"=8,"type"=2},"BatteryCalibrationData1"={"id"=97,"size"=29,"type"=2},"DeviceName2"={"id"=82,"size"=8,"type"=2},"DeviceName3"={"id"=83,"size"=8,"type"=2},"LongDeviceName"={"id"=85,"size"=64,"type"=2},"BatteryState"={"size"=1,"id"=48,"min"=0,"max"=2,"type"=0},"UnloadedAndLoadedBatteryVoltages"={"id"=105,"size"=4,"type"=2},"DeviceName4"={"id"=84,"size"=8,"type"=2},"CalibratedBatteryThresholds2"={"id"=96,"size"=11,"type"=2},"FactoryDefault"={"id"=69,"type"=2},"CalibratedBatteryThresholds1"={"id"=96,"size"=25,"type"=2},"BatteryPercent"={"size"=1,"id"=71,"min"=0,"max"=100,"type"=2},"WillShutdown"={"id"=64,"type"=2},"RecantConnection"={"id"=65,"type"=2},"UserMode"={"size"=1,"id"=67,"min"=1,"max"=3,"type"=2}}
      |   |   |   "BatteryPercent" = 60

Original issue reported on code.google.com by san...@goudswaard.nl on 19 Nov 2012 at 6:57