Samsung SPH-A920 Phone Manual page 47

Using the Travel Charger
To use the travel charger provided with your phone:
Plug the round end of the AC adapter into the phone's power
interface connector and the other end into an electrical outlet.
A red indicator light on the phone lets you know the battery is
charging.
An on-screen indicator lets you know that the battery is
charged.
It takes about three hours to fully recharge a completely rundown battery.
Section 2A: Your Phone: The Basics 25