Samsung SWC-R640LBAXAR - Manual (Page 16)

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1. If needed, lay the phone face down and insert a small object or
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).
2. First, insert the top end of the battery (1), matching the gold
contacts on the battery to those on the inside of the phone.