Manual Chapter 4

4-11
General Maintenance
For maximum safety, the battery charger has a “Pending” status LED,
which lights momentarily when the head is first placed on the charger. If a
battery is very low, or is out of a specific temperature range, it cannot be
safely charged. When this condition occurs the “Pending” indicator
remains light. While “Pending,” the charger is actually charging the bat-
teries at a very low rate. This brings the low battery into acceptable voltage
range. Once the battery temperature and voltage are suitable for charging,
the charger automatically begins trickle charging and the “Trickle” indi-
cator light turns on.
To fast charge or discharge the battery the “Fast” button or “Discharge”
button must be pressed. If the “Fast” button or “Discharge” button is
pressed while the battery voltage is too low or temperature is not suitable
for “Fast” or “Discharge” operation, the indicator light will ash on and off.
This response acknowledges the request but indicates that the charger
cannot follow the request at that time. Once voltage and temperature con-
ditions are suitable, the requested “Fast” or “Discharge” operation will
begin and the indicator light will change to a steady light.
Warning!
Note that if the battery is fully charged, a user is able to
initiate fast charge by pressing the “Fast” button. After
about 2 minutes, the charger will stop fast charge in this
case. However, to avoid overcharging batteries, you
should not press the “Fast” button with an already fully
charged battery.
After the “Fast” charging cycle has completed the charger beeper will
sound and automatically begin trickle charging. When this condition
begins the “Trickle” indicator light turns on indicating that the battery is
almost completely charged or is completely charged. For the laser head bat-
teries, the two conditions occur within a few minutes of each other. Charge
time from a fully discharged set of batteries to approximately a 90% voltage
charge is 15 minutes.

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