That is a much stronger point. To me this factor is still a wash because a) 95% of my development is done on a power cord and b) even if I'm out-and-about on my laptop what kills my battery is other intensive programs (aka FireFox) or running the program I'm working on rather than the editor itself. But I totally get that there are people who need to get more than a few hours out of their laptop at a time and will adjust their tools accordingly.
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