Managing Power 3-3Battery PackYour Tablet PC has two battery packs. The battery pack is the internal powersource for the Tablet PC. It is rechargeable using the AC adapter.NOTE: Care and maintenance information for the battery is provided in the“Battery Pack Guidelines” section in Chapter 7.Charging the Battery PackNOTE: Charging will not start if the battery’s temperature is outside the allowedrange, which is between 0 °C (32 °F) and 50 °C (122 °F). Once the battery’stemperature meets the requirements, charging automatically resumes. During charging, do not disconnect the AC adapter before the batteryhas been fully charged; otherwise you will get a prematurely chargedbattery.To charge the battery pack, connect the AC adapter to the Tablet PC and anelectrical outlet. The Battery Charge Indicator ( ) on the Tablet PC glowsamber to indicate that charging is in progress. You are advised to keep theTablet PC power off while the battery is being charged. When the battery isfully charged, the Battery Charge Indicator glows green.The two battery packs are charged in parallel. It takes approximately 5 hoursto fully charge the two battery packs when the power is off and approximately6 hours when the power is on (may need a longer charging time at lowertemperatures).CAUTION: After the Tablet PC has been fully recharged, do not immediatelydisconnect and reconnect the AC adapter to charge it again. Doing so maydamage the battery.NOTE: The battery level may automatically lessen due to the self-dischargeprocess (0.21% per day), even when the battery pack is fully charged (100%).This happens no matter if the battery pack is installed in the Tablet PC.