Samsung SGH-T209NBBTMB - Manual (Page 12)

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Section 1
4. Place the battery so that the tabs on the end align with
the slots at the bottom of the phone.
5. Press the battery down until it clicks into place. Make
sure that the battery is properly installed before
switching on the phone.
Charging a Battery
Your phone is powered by a rechargeable Li-ion battery. A
travel adapter comes with your phone for charging the
battery. Use only approved batteries and chargers. Ask
your local Samsung dealer for further details.
You can use the phone while the battery is charging, but
this causes the phone to charge more slowly.