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The rechargeable backup battery is a permanent part of the HP Jornada, so you do not need to install or replace it.
The backup battery is being charged automatically when the P/PC is connected to AC power. Continue to charge until the backup battery level is “good.” While charging, backup battery low messages may continue to appear.
Do NOT replace your main battery when the backup battery is low.
You should respond immediately when a message warning of low battery power is displayed. When the battery power is low, simply connect the HP Jornada to AC power to recharge.
Viewing the remaining battery power
To view the remaining battery power
1.Tap Start, then HP settings.
Hold the Start button for 1 second.
The remaining battery power is displayed on a status bar at the bottom of the Settings tab.
Charging the main and backup batteries
To charge the batteries
1.Connect the HP Jornada to AC power.
The AC Charging LED indicates the charging status of the main battery:
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The AC Charging LED is illuminated only if the P/PC is connected to AC power.