CipherLab RK25WO Reference Manual page 53

Using RK25WO Mobile Computer
LOW SUB BATTERY ALERT
When the main battery's power is drained out, RK25WO mobile computer will automatically
suspend by backup battery's power for 30 minutes. When backup battery's power is low,
the "Low Sub Battery" notification will remind you to connect the device with an external
power source to charge it immediately. Please note that do not replace the main battery at
this moment, otherwise data loss may occur.
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