Toshiba T1100 - Batteries
IMPORTANT: T1100, not the T1100 PLUS
Main battery
Powers the laptop when no AC adapter is being used. See here.
Battery within 5.25" and 3.5" External FDD
Page 5-58 of the T1100 maintenance manual indicates that both the 5.25" and 3.5" external floppy disk drives contain a "Ni-Cad Battery Unit".
For the external 5.25" drive, a drawing showing the battery is on page 3-19.
For the external 3.5" drive, a drawing showing the battery is on page 3-23.