To Install A Second Battery - HP OmniBook 4150 Reference Manual

WARNING
6. With the latch in the open position, slide the charged battery into the OmniBook until
it is flush with the unit.
7. Close the battery bay release latch.
Do not mutilate, puncture, or dispose of batteries in fire. A battery can burst or
explode, releasing hazardous chemicals. A rechargeable battery must be recycled
or disposed of properly. For more information about battery safety, see "Battery
Safety" on page 133.

To install a second battery

The OmniBook's plug-in module bay accepts a second battery. See "Using Plug-In
Modules" on page 62 for information about installing plug-in modules.
Managing Battery Power
Monitoring Battery Power
Reference Guide 55