Tips 7battery charge is getting too low, the battery icon( ) blinks and the phone sounds a warning tone.There is also an internal backup battery that saves all thesettings in the phone when the regular battery isdischarged. An internal backup battery needs to becharged initially for 24 hours. To make sure the internalbattery is charged, do not disconnect the main batteryfrom the phone for 24 hours. When the external batteryis fully discharged, the internal battery will maintaindata for 15 hours. Once the Internal battery is fullydischarged, all data is lost and a HotSync operationmust be performed to retrieve any lost data.Screen CalibrationThe first time the handheld computer is turned on, asetup screen is displayed with instructions. Theseinstructions include a calibration setup that aligns theinternal circuitry with the touch sensitive screen.Make sure you always use the stylus when touching thescreen. If you use another device or your fingernail, thedevice is not be calibrated correctly and the touch areawill not be accurate.