Just follow the discussion in the owners manual here:
http://www.samsung.com/us/support/owners/product/SCH-U365HAAVZW
The battery cover on the back of the phone protects the battery.
Removing the battery cover
1. Hold the phone firmly and locate the Cover Release Latch.
2. Firmly "pop" the cover off the phone.
Installing the battery cover
Align the cover and press it into place, making sure it snaps securely.
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