HP TC4400 - Manual (Page 89)

5–6 Maintenance and Service Guide
Removal and Replacement Procedures
4. Remove the battery pack by following these steps:
a. Turn the tablet PC upside down with the rear panel
toward you.
b. Slide the battery release latch 1 toward you. (The right
side of the battery pack disengages from the tablet PC.)
c. Lift the right side of the battery pack and swing it to the
left 2 and remove it.
Removing the Battery Pack
Reverse the above procedure to install the battery pack.
Battery Pack Spare Part Number Information
6-cell battery pack 419111-001