I wouldn't say there is zero reason for logic on a NiMH battery pack. If you want to charge a NiMH battery as fast as possible (say at 1C...which for be 2000mA for a 2000mAh battery). Then the best way to determine charge termination is to look at dT/dt...or the change in battery pack temperature with time. If the change in temperature over a unit time exceeds a certain limit, then the pack is charged and it is time to terminate the constant current charging cycle. A NiCad cell voltage will start to drop when it is fully charged, this can be used to terminate charging for this type of battery. But for a NiMH, this voltage drop is much less pronounced. So a dT/dt method is used instead.
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