Viavi HST-3000 User Manual page 196

Chapter 14 Maintenance and Troubleshooting
Maintaining the battery
HST Batt LED The HST's Batt LED is a tri-color LED.
Table 26 Batt LED indications
Condition
Low battery (about 8% left)
Very low battery (about 4% left)
Unit will turn off (about 2% left)
NOTE: After the low battery indication appears, there is about 20 minutes
(depending on the application) until you will see the very low battery indica-
tion. After this, there is about 10 minutes before the HST turns off. This is a
total of about 30 minutes from low battery to power down.
Charging
HST unable to get battery data
Battery capacity inaccurate
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LED indications.
A solid amber Batt light or LED on the HST does not mean
there are battery problems that need immediate attention. The
battery is fully functional and can still be used, but understand
that the fuel or gas gauge (also called battery capacity indi-
cator) on the HST is not going to give an indication of the
remaining capacity of the battery pack.
The Batt LED is lit amber (solid, not flashing) to show that the
fuel gauge chip or IC inside the pack is telling the HST it's
capacity reading may be inaccurate. The main reason for this
is that the IC that protects the battery cells has removed the
connections from the battery to all other circuitry inside the
pack including the fuel gauge chip.
The protection chip looks at the batteries themselves to make
sure the voltage does not get too low and that a large amount
of current is not drawn from the battery in a short period of
time. This would normally indicate an external short of the
pack.
HST-3000 Base Unit User's Guide
Indication
Solid Red
Flashing Red about once a second
Flashing Red several times a second
Solid Green
Flashing Amber
Solid Amber
Table 26 describes the