Our differences seem to be whether or not having the battery unremovable is made up for by increased working time. I doubt that the increased working time is significant and therefore not worth it. You seem to think that the additional time is worth it.

Personally, I feel like moving from 5.5 hours to 6.5 hours, while numerically significant, is pointless in the real world. I can't think of any useful threshold at the 6 hour mark.

Let me reword that; it's been pointed out to me that I might not be being clear. Additional battery life is never pointless, but an extra hour isn't going to change anyone's usage pattern, especially considering that that number is probably well within the margin of error for how long either battery is actually going to last doing real work. In particular, that 15% improvement certainly doesn't make up for the loss of a 100% improvement.