HP Compaq NX4820 Maintenance And Service Manual page 119

Removal and Replacement Procedures
b. Slide and hold the battery release latch 1 to the left.
c. Lift the front edge of the battery pack 2 up and swing it
d. Remove the battery pack.
Removing the Battery Pack
Reverse the above procedure to install the battery pack.
5–6
(The front edge of the battery pack disengages from the
computer.)
back.
Maintenance and Service Guide