User's Manual

12
8700 Series Mobile Computer Reference Manual
1.1.2 BACKUP BATTERY
The backup battery o n the main board take s the respo nsibility to s upply po wer to the
mobile computer when the main battery is re moved or drained out. When fully charged,
the 3.0 V/7 mAh rechargeable Lithium button cell helps retain data in SRAM and maintain
the r unning of t he real-time clock and calendar for at l east 25 days without the mai n
battery. In the meantime, you ha ve to repl ace the main battery as soon as possible. It
takes at least t wenty-four h ours t o f ully ch arge t he back up batt ery. How ever, it is n ot
necessary to fully charge the backup battery for the mobile computer to work.
 Monitor voltage level by System Menu (see 3.5 Power)
1.1.3 CAUTION OF LOW BATTERY CHARGE
The battery pack is the only power source for the mobile computer to work. It also
charges the backup b attery on the main bo ard so the data stored in SRAM can be
retained properly. Therefore when the main battery charge goes low, you need to replace
the ba ttery pack wi th a charged one or charge it as soon as possible. Most of all, you
should upload important data on a regular basis.
Warning: Data loss may occur with SRAM durin g low battery condition. Always save
data before running out of power or keep a fresh battery for replacement.