I have a 18 V NiCad Battery charger which doesn't seem to charge the battery. I checked the output voltage without a battery connected, it showed 5 VDC. Just wonder if this is OK since battery is not connected? With battery connected should be OK? I don't have the battery with me now, hence the question.

 

It may be OK if it uses unsmoothed rectified power. You need to connect a battery and see if the voltage rises when the charger is switched on.

 

What is the charger make and model?

 

Is it a Drill charger?

 

It is a Craftsman convertible cordless charger for a grass trimmer 18VDC Nicad

 

Can you measure the Voltages when the battery is connected?

 

I misplaced the battery but looking for it

 

I misplaced the battery but looking for it

 

Found the battery - before connecting it, charger read 0V. After connecting, it read 12V and slowly went up to 16 VDC. But, this was the voltage of the battery before connecting the charger so seems charger is defective. It is a Craftsman 1-hour battery charger 18VDC p/n 700994. Both le lights i.e. charging (red) and ready to use (green) do not light. Can't find a schematic for it.

 

Please, only one thread per topic. You started a second thread here that has more recent posts, so let's go with that one.

https://forum.allaboutcircuits.com/threads/nicad-battery-charger.160710/#post-1512327