Motorola C390 - Manual (Page 17)

Getting Started - 17
Installing the Battery
Note: If necessary, remove the battery from its protective clear
plastic case.
Your phone is designed to use only Motorola Original
batteries and accessories. We recommend that you store
batteries in their protective cases when not in use.
1 Squeeze the sides of the front housing in the middle of the
"Motorola" logo as shown in the diagram;
2 Simultaneously press the release button on the top of the
phone with the thumb of your free hand;
3 While implementing Steps 1 and 2, pull the rear housing away
from the phone.