LR type B's, are the best I have tried so far. Unfortunately though, now I have about 6 LR type A's, 2 standard type A's, 4 standard type B's and only 1 LR type B...... All of which are still working great though! Oh and I would also like to point out that I am finding that I have to break apart and clean my type B's way less than my type A's, as they are less prone to gumming up than the A's for some reason.