Samsung SGH-T619SSBTMB - Manual (Page 12)

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Section 1
5. (1) Place the battery so that the tabs on the end align
with the slots at the bottom of the phone. (2) Press the
battery down until it clicks into place.
6. Replace the battery cover. 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
doing so will require additional charging time.