10
8200 Series Mobile Computer Reference Manual
1.1.2 BACKUP BATTERY
The backup battery on the main board takes charge when the main battery is removed or
drained out. When fully charged, the 3.0 V/18 mAh rechargeable Lithium button cell
helps retain data in SRAM and maintain the running of the real-time clock and calendar
for at least 25 days without the main battery. In the meantime, you have to replace the
main battery as soon as possible. It takes at least 72 hours to fully charge the backup
battery. However, it is not necessary to fully charge the backup battery for the mobile
computer to work.
Monitor voltage level (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 battery on the main board so that the data stored in SRAM can be
retained properly. Therefore, when the main battery charge goes low, you need to
replace the battery pack with 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 during low battery condition. Always save
data before running out of power or keep a fresh battery for replacement.
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