A battery that is fully discharged is about 1.00V/cell. During charge, the analyzer applies a
constant current. As the battery gets charged, the voltage rises. Charge is terminated
depending on how the NiCd and NiMH Optimization have been set (see Setting the
Optimization, page 79).
If NiCd and NiMH Optimization have been set to Capacity, the battery is terminated when a
negative slope (a gradual voltage drop indicating that the battery is fully charged) is
encountered. If there is a voltage plateau or temperature rise more than dT/dt, the current is
reduced by half and the charge continues until the battery reaches full charge. For NiMH
batteries, the current is often reduced by half twice.
If NiCd and NiMH Optimization have been set to Time (this is the default setting), the
temperature will be monitored and charge will terminate when the battery reaches either the
negative slope, dT/dt or maximum battery temperature.
This table summarizes the charge methods:
NiCd and NiMH
Optimization
dT/dt Negative Slope
(dV/dt)
Max Temperature
Capacity Current is reduced Charge is complete Current is reduced
Time Charge is completed Charge is completed Charge is completed
149
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