Use this NiMH battery discharger or NiCad discharger circuit when you need to discharge a battery fast and safe. This circuit is suitable for NiMH or NiCad batteries and is cheap and easy to build but the elements must be corelated with the number of battery elements.
When D2 is on, the battery is discharging whrough R4 and T1. When the battery voltage drops below the value fixed with P1, T1 wont receive base current. The LED will go off and the discharger circuit can be removed.
Battery Discharger Circuit Diagram
The battery discharger circuit can be tested with a variable power supply (with current limitator). Connect the discharger circuit at the power supply, adjust the voltage at the desired level at which T1 is blocked. Adjust P1 until D2 lights a bit.
Because the amplification is not too high, there is a zone where D2 goes off gradually and the current decrease gradually. R4 value is calculated for a discharging current of 0.5 A.
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