How is the remaining battery capacity calculated? I have two apps, advanced power and QtBatteryWidget, and they show weird numbers. Sometimes I get very low "percentage remaining" (e.g. 20 %) while "capacity remaining" (e.g. 600 mAh) indicates that the battery is still half full. The percentage rating seems to be connected to either CPU-load or voltage (which would be connected to CPU-load as well) as it fluctuates a lot under load.
Which number can I trust?