thanks. yeah the charger is for nicads and working. Used to use it for an old an old Smart offroad unit 12volt light jobby. Good point about the cells being charged differently, although they were both new and should be emptyish.
Ziog, sorry not able to do photo's –
4 leads. POS A, POS B, NEG A, NEG B.
2 connected together – POS A, NEG A. connects both packs.
2 to the bulb POS B , NEG B.
Hope that is clearer.
I'll will check each cell with a voltmeter but am unsure of how to do so in the are indeed flat.
Is the charger polarity to be checked a/c with a voltmeter? or d/c. Is it safe?
Cheers