Keysight N9923A FieldFox User Manual page 149

The external battery charger (N9910X–872), lets you charge a fully depleted battery
in approximately three hours. It is a two bay, level–3 stand-alone battery charger
that is compliant with the standard Smart Battery System. The two bays are charged
sequentially on a first-come, first-served basis, though a discharge can be performed
in the left bay while the right bay is charging. It uses an external universal switching
power supply
For more information, refer to the Instruction Manual included with the external
battery charger.
Reconditioning the Battery
The battery contains electronics that monitors battery usage and tracks how much
capacity is available. This function can become less accurate because of temperature
fluctuations, aging, self-discharge, repeated partial charging, and other factors.
Reconditioning - also known as recalibrating - restores the accuracy of the battery
capacity tracking system.
Reconditioning does NOT affect actual battery performance. It only recalibrates the
charge level indicator.
Reconditioning is done by fully charging the battery, fully discharging it, recharging it
again, and then verifying that the error has been corrected.
How to determine if a battery needs reconditioning
1. Press System then
2. On the Battery screen, if the Max Error is 10% or greater, the battery needs to be
 This error will affect many of the displayed battery charge indicators.
After reconditioning, if the battery is not fully charged or continues to show more
than a 9% Max Error reading, repeat the reconditioning procedure.
If the third reconditioning does not restore a full charge and give an error reading of
9% or less, the battery may need replacement.
You can recondition a battery internally, or with the External Charger (N9910X–872).
The external charger process is faster and simpler.
How to perform Internal Reconditioning
1. Fully charge the battery inside the FieldFox (either ON or OFF) using the AC/DC
2. Confirm that the battery is fully charged. When fully charged, the following icon
Working with the Lithium-Ion Battery
External Battery Charger LED
Green
Green flashing
Yellow flashing
Yellow/green
Red flashing
Yellow
Service Diagnostics
reconditioned.
adapter.
appears on the FieldFox:
Charging Status
Fully charged
Fast charging
Reconditioning – the accuracy of the
battery's internal LED charge gauge is
being renewed. See "Reconditioning
Batteries."
Battery is reconditioned
Error
Standby
then Battery.
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