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BATTERY PACK AND CHARGER INFORMATION
5-2
November 1999
Part No. 001-7780-500
change in voltage) sensing to determine when the
battery is nearly fully charged. This type of sensing
prolongs battery pack life because overcharging is
minimized.
Operation is in the fast charge mode until the
battery pack is approximately 95% charged. Charging
is then in the slow mode until the pack is removed
from the charger. With these battery packs, the fast
rate is approximately 1400 mA and the slow rate is
approximately 70 mA.
When the battery is inserted in the charger, the
red charge indicator turns on continuously to indicate
that charging in the fast mode is occurring. If this indi-
cator flashes at a slow rate when the pack is inserted, it
indicates that charging is occurring at the slow rate
because battery parameters are not within the required
range. The battery temperature must be within +50 to
+104° F (+10 to +40° C) and the battery voltage must
be above 6 volts for rapid charging to occur. When
these parameters reach the normal range, the charger
automatically switches to the fast rate.
The primary method used by these chargers to
detect a fully charged battery is to sense the point at
which the battery temperature begins increasing at a
faster rate (
∆T/∆t). This normally provides the first
indication that the battery is fully charged. If this
method does not indicate a charged battery, the charger
also detects a negative change in battery voltage
(minus
∆V) which also indicates a fully charged
battery.
To provide fail-safe operation, the charger also
switches to the slow rate if the battery temperature
rises above approximately 113° F or total charge time
in the fast mode exceeds approximately 1.5 hours.
When the battery is fully charged, the charge
indicator begins flashing at a rapid rate and the slow
charge rate is selected. The charger then remains in
this mode until the battery is removed from the
charger.