I have not tried to seperate the ones with the big plug. I had a bunch with the tubes up through al fins. I might try the seperation next time. I have had several laptop ones that are a mix and fused together. They come apart, but have been leaving the copper pretty dirty.

I guess the next time I get a few, I will seperate and do the math. The ones with the tubing and fins are very prevalent in Dell computers. They are large and in charge. I just gave up based on the small laptop ones and figured the rest would garnish the same results.