Just a quick question while we've been on the subject of batteries of late. Is the internal resistance less on an Energizer lithium vs. the Titanium/Ultra? I know from what's already been said on the subject so far that the internal resistance in the Titaniums is less than a normal alkaline, but how does it compare with Lithiums? Is that one of the keys of why a lithium performs so much better than a normal alkaline? Hmm… Something new to ponder.