Sony BKP-L551 Installation Manual page 16

Attaching the Battery Adaptor
Attaching the battery pack
Projections
Connector
1
Fit the slots on the BP-L60/L90 Battery Pack over
the projections on the battery adaptor.
2
Slide the battery pack down until the connectors on
the battery pack and battery adaptor are connected
and the battery pack is firmly attached.
4(E)
Removing the battery pack
Keep the lever on the battery adaptor depressed and
pull up the battery pack.
Slots
BP-L60/L90 Battery Pack
Lever
BP-L60/L90
Battery Pack