39CAUTION: After the device 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 device.Low Battery Signals and ActionsCAUTION: When you recharge the battery upon a warning of low power,you should charge for at least 30 minutes. If you unplug the AC adaptersoon, you may not have sufficient battery power for your operation.The battery status (charging or discharging) and level (as a percentage offully charged) are displayed at the top of the screen. To check the batteryinformation, touch (on the Home screen) Settings Battery.On the exterior side of the battery pack is a gas gauge for displaying theestimated battery charge. When the battery pack is not installed in thedevice and you want to know the battery charge, you can press the switch tto see the number of LEDs that light up. Each LED represents 20% charge.You should save your data and recharge the battery immediately upon awarning of low power; otherwise your device will turn off automatically.You need to connect the device to external AC power for charging beforeyou can use it again.Switch