Juniper Allegro CE Owner's Manual page 45

The NiMH batteries inside the Allegro battery packs are recyclable. We
encourage you to find a business in your area that provides battery
recycling bins for public use as an alternative to placing used battery
packs into the trash, thus conserving natural resources and preserving
the environment.
Spare NiMH Battery Packs
Spare battery packs should be stored in a cool location. Avoid placing
battery packs "contact side" down on a metal surface. Also, do not
stack packs so that their contacts touch one another. These practices
will cause the batteries to drain. The shelf-life of a battery pack is
about two months. Before using a spare pack, you should charge it.
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Short-Term Backup Supply
The Allegro has a super capacitor that behaves like a backup battery.
When the main batteries are removed, the capacitor maintains the
RAM for up to five minutes, allowing you plenty of time to change the
batteries. The capacitor cannot operate the Allegro. The capacitor is
charged by the batteries. It holds a charge as long as the batteries or
external power are supplied. When a battery pack is replaced, the
capacitor charges up to full capacity in about two minutes.
If power is not supplied to the Allegro for more than five minutes, the
Allegro resets when the battery pack is replaced or charged. All the
programs, data, and applications saved to the disk (C_Drive) 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.
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Real Time Clock
The Allegro does not have a backup clock. You will need to reset the
clock on the Allegro when the Allegro's power completely stops for
over five minutes.
Hardware Features Page 2-33