Compaq Armada M300 Series Reference Manual page 36

When a battery pack that is the only source of power available
to the computer reaches a low-battery condition
The system beeps 5 times.
The battery light
If the low-battery condition is not resolved, the computer will
enter a critical low-battery condition. In a critical low-battery
condition,
If Hibernation is enabled and the computer is on or in
Suspend (Standby)—The computer beeps twice, then
initiates Hibernation. Hibernation is enabled by default.
If Hibernation is disabled and the computer is on or in
Suspend (Standby)—The computer beeps twice, and the
power/suspend light
briefly in Suspend (Standby), then shuts down and your
unsaved work is lost.
blinks.
blinks. The computer remains