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3.  Disconnect the charger when the battery is fully charged. 
  NOTE: If the battery is extremely low, the phone may 
not power on even during charging. Try again 
after charging the phone for at least 20 
minutes. Contact Customer Service if you still 
cannot power on the phone after prolonged 
charging. 
Extending the Battery Life 
Active applications, screen brightness levels, Bluetooth and 
Wi-Fi use, and Location functionality can drain the battery. To 
conserve battery power: 
  Reduce the screen backlight time 
  Lower the screen brightness 
  Turn Wi-Fi, Bluetooth, and auto-sync off when not in use 
  Disable the Location feature when you don’t need it. Most 
applications that use the Location feature query the GPS 
satellites periodically for current location. Each query 
drains the battery. 
Powering On and Off 
  Press and hold the Power button to turn on your phone. 
  To power off, press and hold the Power button and touch 
Power off on the menu. 
  NOTE: If the phone freezes or takes too long to respond, 
press and hold the Power button for about 10 
seconds to restart the phone.