To conserve battery, set the screen Brightness to low. Note: From the home screen, press the Right soft key > Settings > Phone Settings > Display > Brightness
Reduce the screen Backlight timeout. Note: From the home screen, press the Right soft key > Settings > Phone Settings > Display > Backlight > Screen
Turn off Bluetooth when not in use. Note: From the home screen, press the Right soft key > Bluetooth > Power
If you are traveling and do not have access to mobile or Wi-Fi networks, switch to Airplane mode. Note: From the home screen, press the Right soft key > Settings > Flight Mode > Flight Mode