Kegel FLEX 17-5801 Operator's Manual page 138

To adjust the voltage meters accurately you
must have a dependable voltmeter. Locate the
three-pin plug above the fuse bank.
Put the voltmeter probes in the appropriate
pins then add or subtract using the buttons at
the bottom of the screen until the Voltage on
the screen matches the correct Voltage from
the external voltmeter.
Each time the machine is powered-up after charging, the
machine will detect the full charge and count it. If the
machine has not gone below 25 Volts when put on charge
the charge will not be counted. Always change date when
replacing batteries.
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The screen to the left provides information about calibrating
the Voltage display.
The screen to the left provides instructions to reset the
battery cycle counter when a new battery, or a set of
batteries are installed in the machine.