I have found the Lio batts to be better, and in dewalt, the XPS batteries are much better than their basic black 18v batts.
As well on the 3v B&D, there was the sliver and the gold batteries, the golds are still going strong the silver died off atleast 7 years ago... only lasting 1-2 years.
Same for Mikita, they had the black stick 9. 2v batteries and the grey versions, most of my black ones are dead and gone and by YEARS, the better greys are still going strong...
I don't remember what chemical bass the grey ones are...