Texas Instruments TravelMate 4000M User Reference Manual page 215

Using the Portable
CD-ROM Docking System
Note: The Portable CD-ROM Docking System cannot run
on battery power if a third-party SCSI hard drive is
installed. You must use AC power.
The battery for the Portable CD-ROM Docking System can
power both the Portable CD-ROM Docking System and the
notebook. If the battery in the CD-ROM Docking System is
too low to power the notebook, the notebook enters into
Standby mode. You can place a charged battery in the
notebook without first having to turn the system off. After
inserting a new battery, press Standby to return to normal
operations.
12-14 Portable CD-ROM Docking System