Please compare Commodore C286-LT `with Commodore C386SX-LT.
Backlight Power Inverter Module
21 MB Conner CP-2024
Floppy Disk Drive
TEAC FD-335HF 063-U
BIOS entry key combination is CTRL-ALT-ESC pressed after the system booted.
For the instructions on pinouts, power supply replacement and battery replacement, please see Power Supply section of Commodore C386SX-LT page. They are exactly the same.
The original battery pack is 12V, 1700mAh. The replacement battery can still be purchased by the product code P170AE-10LX. In the absence of the battery pack, the computer can be started with external 12V power supply connected directly to the battery terminals at the laptop.