User's Manual

Spectra Precision Focus 4 Total Station User Guide 27
Setting up the Instrument 2
• Lithium-ion batteries should not be charged above 40 °C to 45 °C (104 °F to
113 °F). A blinking charge light may mean that the batteries are too hot for
charging. Charging will resume after the batteries cool down.
Conditioning / calibrating a battery
You must calibrate the battery (“condition”) once every 6 months or more often if
required. Calibration ensures that the reported remaining battery charge is accurate.
To start calibrating a battery, hold down the calibration button on the unit and then
insert a battery. Only the battery that was inserted while the button is pressed begins
calibration.
During battery calibration, the battery will be charged, discharged completely, and
then recharged again. Calibration should complete in approximately 17 hours. Do not
cover the charger vents during a calibration cycle.
• The blue calibration indicator light(s) blink slowly (on 1.5 sec, off 2 sec) while
calibration is in progress. The charge light(s) may be on or off during the
calibration cycle if the case temperature does not get too high.
• When a calibration cycle is completed, the calibration light stops blinking but
remains on until the corresponding battery is removed.
• Case temperature:
– The temperature of the bottom case may continue to climb to
approximately 43 °C before temperature regulation is enabled to keep the
case from becoming warmer. As the battery voltage drops, the case cools
down and the automatic temperature limiting is no longer necessary. This
minimizes the time required to discharge a battery.
– If the case temperature continues to become too hot internally, even after
temperature regulation is enabled, there is a secondary failsafe that aborts
the calibration completely. If an abort occurs, the calibration light(s) blink
rapidly and battery charging is re-enabled.