Sony VGN-BX61MN User Manual page 25

3 Slide the battery pack diagonally into the battery compartment until the projections (2) on either side of the battery
compartment fit into the U-shaped cuts (3) on either side of the battery pack.
4 Rotate the battery pack in the direction of the arrow, and push the battery pack down into the compartment until it clicks
into place.
5 Slide the battery LOCK/UNLOCK switch to the LOCK position to secure the battery pack to the computer.
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Getting Started