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NOTE 1 - The PowerCenter charges one battery while it discharges the
other to reduce the calibration time of two batteries.
NOTE 2 - An interruption in input power will cancel the calibration
sequence for batteries that have not already completed the sequence.
The PowerCenter will default into charging mode and the batteries will
be charged when power is restored.
NOTE 3 - An internal battery must be installed in the PowerBook when
batteries are being calibrated in the PowerCenter. This battery is only
needed to keep the PowerBook ON when the discharge transfers
between batteries are made by the PowerCenter.