Juniper Systems Allegro DOS Manual - Manual (Page 53)

Hardware Features Page 2-35
If power is not supplied to the Allegro for more than five minutes, the
Allegro reboots when the battery pack is replaced or charged. All the
programs, data, and applications saved to the disk are safe. Information
that was not saved to the disk is lost.
The super capacitor should not need replacement through the life of the
Allegro.
▲ ▲ ▲ ▲ ▲ Backup Battery, Real Time Clock
A 3.6 V lithium backup battery supplies current to the Allegro to
maintain the real time clock when power is not supplied to the Allegro.
This battery should last for at least five years.
Replacing the Lithium Backup Battery
If the Allegro does not hold the date and time or you get a CMOS error
message, the lithium battery needs to be replaced. You can check and
see whether or not the lithium battery is good or bad.
In Windows CE, go to Control Panel|Power Properties |Battery.
Additionally, when it is low, the following icon appears in the system
tray on the Windows CE Desktop
.
In DOS, go to System Setup Program|System Information Screen to view
the status of the lithium battery.
You must return your Allegro to the factory for lithium backup battery
replacement.