Compaq 1610 Reference Manual page 21

Backup battery
compartment
Main battery
compartment
PC Card slot
PC Card eject
lever
Reset button
Expansion
compartment
Contains the CR2032 lithium coin battery
which acts as a backup battery when the
main batteries are drained or removed.
Holds two AA alkaline batteries or a
rechargeable NiMH battery pack for
supplying primary battery power to the
device.
Accepts a Type I or Type II PC (PCMCIA)
Card. For more on this feature, see
Chapter 6, "Using PC Cards."
Ejects a PC Card from the PC Card slot.
Restarts the operating system.
Contains the RAM module. Accepts
optional RAM upgrades.