This Nicad Battery zapper circuit clears internal shorts in nickel-cadmium batteries by burning them away.
Nicad Battery Zapper Parts list :
Resistor : 220 ohm, 1 K ohm, 8K2 ohm, 3K9 ohm
Dioda : 1N4006
SCR : C106Y
Capacitor : 100uF/200V
CAUTION : The negative nicad battery terminal is linked to one side of the AC line. For secure operation, use a 1:1 isolation transformer.