Juniper Allegro CE Owner's Manual page 60

SRAM Cards
Power
SRAM cards are powered by the Allegro while installed in the PC
card slot. An on-board battery retains data when the card is not being
powered by the Allegro. Some brands have a replaceable lithium
battery (coin type). If you have this type, make sure that the battery is
installed before attempting to use the card. Other brands have a
rechargeable battery that is automatically recharged while it is inside
the Allegro. The rechargeable batteries are not replaceable.
The life of these batteries varies greatly depending on usage and the
memory size of the card. If the lithium battery in the card is drained,
the information stored on the card is lost. When a new battery is
installed, the card needs to be formatted. The manufacturer's
instructions that came with the card includes information on battery
life and recommended charging intervals.
Replacing SRAM Card Batteries
SRAM card batteries are readily available at most stores. Unless the
manufacturer's instructions state otherwise, we recommend that you
change the battery every six months.
Formatting SRAM Cards
SRAM cards come pre-formatted. Files and directories can be copied
onto it just like a standard disk drive.
Inserting and Removing Cards
For details on how to access the PC card slot and insert and remove
cards, refer to Chapter 2, Hardware Components, PC Card Slot.
Page 3-6 Memory and Data Storage