Panasonic 52 - Toughbook - Core 2 Duo P8400 Care And Maintenance Manual page 28

Care and maintenance
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Battery
There are times when the charging system "resets" after leaving the unit powered off and removing the battery for a few minutes
If the light continues to blink red with your battery the battery is faulty, otherwise the system is at fault
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Troubleshooting
Symptom:
Battery Status Light is Blinking Red
Issue:
Battery malfunction or fault
Charging circuit malfunction or fault
Steps:
Power unit off
Remove AC Adapter
Remove AC Adapter
Remove Battery
Wait five minutes
Install battery and attach AC adapter
Swap batteries with another CF-52
Run the Battery Recalibration program
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Toughbook 52

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