Keysight N9912A User Manual page 186

6. Battery Temperature – internal temperature of the battery as measured by a
7. Present Run Time to Empty – minutes of power remaining based on amount of
8. Charge Cycles – number of charge cycles the battery has experienced. Charge
Built-In Battery Gauge
Each lithium ion battery has an LED gauge that displays its charge status. The gauge
is active unless the battery is in shutdown mode.
To view the LED gauge, open the FieldFox battery compartment door, remove the
battery, then press the button on the battery.
The battery in your FieldFox will have either 4 or 5 LED segments.
Charging the Battery
When you receive your FieldFox, the lithium-ion battery is partially charged to
approximately 30% to 40% to preserve battery life. Allow four hours to fully charge
the battery internally, or three hours by using the external battery charger (N9910X–
872). A fully charged battery will power your FieldFox for about four hours. It is NOT
necessary for you to do any type of battery preconditioning before use.
The FieldFox circuitry ALWAYS prevents the battery from discharging to a level that
is damaging. However, if the battery is completely discharged, the FieldFox may not
turn ON. If this occurs, the battery can still be charged either internally or externally.
Because a lithium-ion battery has no memory effect, you can charge a battery at any
time regardless of the current charge status. However, this could impair the accuracy
of its internal charge-remaining indicator. When the Max Error is 10% or greater, the
battery should be reconditioned. Learn more on page 188.
Internal Charging with the AC/DC Adapter
Important: Read the safety information for the AC/DC adapter on page 192.
Internal charging time for a fully depleted battery is approximately 4 hours with the
FieldFox either ON or OFF.
186
sensor embedded in the battery.
current being used now.
cycle defined as ≥80% change in relative state of charge.
5-segment Charge
Gauge Remaining
5 segments ≥80%
4 segments 60% to 79%
3 segments 40% to 59%
2 segments 20% to 39%
1 segment < 20%
4-segment Charge
Gauge Remaining
4 segments ≥75%
3 segments 50%,to 74%
2 segments 25% to 49%
1 segment < 25%
FieldFox User's Guide