In order to ensure that the battery pack is fully charged, it is recommended that the battery pack be charged for at least 12 hours with the radio turned OFF.
!1. Only use our NiMH battery pack and AC adapter.
2.Do not attempt to charge alkaline batteries or any batteries or battery packs other than the one indicated in the manual. This may cause leakage and damage to the radio.
3.For long term storage of the radio, turn the radio OFF and remove the batteries from the radio.
LOW BATTERY LEVEL INDICATOR
Your LXT500/535 Series has a LOW BATTERY 
ICON which will only appear on the LCD display if the battery voltage level is low. At this point, the battery needs to be charged for at least 12 hrs.
OPERATING YOUR RADIO
POWER ON/OFF AND VOLUME
Press the POWER/MENU button for at least 3 seconds to turn the radio on/off. During Power On, the radio will beep 3 times with different tones, the LCD will display all icons for 1 second and the LCD display will indicate the last channel selected.
To increase/decrease the volume level, press the ▲\▼ buttons during RX or STANDBY mode.
TRANSMITTING AND RECEIVING A CALL
To communicate, all radios in your group must be set to the same channel.
1.For maximum clarity, hold the radio 2 to 3 inches from your mouth.
2.Press and hold the PTT button and speak in a normal voice into the microphone. The TX icon will appear continuously on the LCD display while transmitting.
3.To receive a call, release the PTT button. The RX icon will appear on the display when your radio is receiving a transmission.