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Looking at the "business" side of a Topcat battery pack, there are, of course, two terminals, eccentrically placed--one more or less central, the other nearer to an end.

Which is positive and which is negative?

Many thanks in advance.

Les

From this very Museum.

From the calc POV:

From the battery POV:

Cheers

Etienne

Thanks! I am delighted to report that I figured this out otherwise and was able to use the info to zap back to some life 2 out of 3 beyond-dead NiCd Topcat packs. Very happy :)