Samsung SCH-R640 User Manual page 16

If needed, lay the phone face down and insert a small object or
1.
thumbnail into the slot at the top of the battery cover (1) and
gently pry it away from the phone. Then, lift the cover away
from the phone (2).
First, insert the top end of the battery (1), matching the gold
2.
contacts on the battery to those on the inside of the phone.
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