xii ContentsContentsUnderstanding emergency mode.............................. 47Stealth and non-stealth emergency modes ........... 47What happens during an emergency call? ............ 48Making an emergency call ................................... 498 Charging and caring for batteries ............ 50Removing the battery .................................................. 51About your charger ..................................................... 52About battery charging ............................................... 53Low battery warning ................................................ 53Optimal charging temperature ................................. 53Charging the battery................................................ 54Receiving and making calls while charging ............... 55Maintaining battery life and performance .................... 56Battery safety vent ................................................... 56Storing batteries .......................................................... 57Using nickel-based batteries after storage ................ 57Disposing of batteries .................................................. 579 Troubleshooting ........................................ 58Troubleshooting .......................................................... 59Error messages......................................................... 59When your radio won’t turn on................................ 60Removing a belt clip................................................. 60Checking the version of your radio........................... 61Troubleshooting your charger .................................. 61General care ................................................................ 62Cleaning the radio ................................................... 6210 Customizing your radio............................. 63About display and keypad backlighting ........................ 64Turning backlighting on or off.................................. 64Using the Main menu .......................................... 64Using a function key ............................................ 65Adjusting the display contrast ...................................... 65Extending battery life on a shift ................................... 66Turning low power transmit on and off.................... 66Using the Main menu .......................................... 66Using a function key ............................................ 67Customizing the audible alert tone settings ................. 68Changing the volume of all audible tones ................ 68