Compaq Armada 7400 Reference Manual page 48

Stop working and save your work immediately.
1. Press the suspend button to initiate Suspend.
2. Wait until the power/suspend light flashes.
3. Remove the discharged battery pack.
4. Insert a fully charged battery pack.
5. Press the suspend button again to exit Suspend.
6. Continue your work.
To resolve a low battery condition when no power sources are
available, select one of these methods:
Initiate Hibernation until a power source is available
Turn off the computer until a power source is available