Working with the Lithium-Ion Battery 173
5. Current – amount of current being consumed when operating from internal
battery. If battery is charging, indicates amount of charging current.
6. Average Current – running average of current, as just explained in item #5 .
7. Battery Temperature – internal temperature of the battery as measured by a
sensor embedded in the battery.
8. Max Error – present accuracy of the battery gauge. If the error exceeds 10%,
you should recondition the battery. Learn more on page 175.
9. Relative State of Charge – current charge compared to actual full capacity.
This number lowers with age and number of battery cycles.
10. Absolute State of Charge – current charge compared to designed full
capacity of a new battery.
11. Remaining Capacity – number of amp hours remaining.
12. Full Charge Capacity – number of amp hours when fully charged.
13. Present Run Time to Empty – minutes of run time remaining based on
amount of current being used now.
14. Average Run Time to Empty – minutes of run time remaining based on
running average of current being used.
15. Charge Cycles – number of charge cycles battery has experienced. Charge
cycle defined as ≥80% change in relative state of charge.
Built-In Battery Gauge
Each lithium ion battery has an LCD gauge that displays its charge status. Each
segment represents 20% of the charge capacity. The gauge is active unless the
battery is in shutdown mode. To view the LCD gauge on the Inspired Energy
battery, open the FieldFox battery compartment door.
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