Samsung SPH-A880TSSXAR - Manual (Page 40)

26 Section 2A: Your Sprint PCS Phone: The Basics
Installing the Battery
To install the Li-Ion battery:
1. To install, insert the battery into the bottom of the
phone at a 45-degree angle, making sure to line up
the tabs.
2. Gently press down the top of the battery until it
snaps into place.