Just read that piece myself... it feels like a bit of a cop out? Some of it is common sense stuff to make the battery last, but some of it feels like its making excuses for the battery life, if you get what I mean? It suggests using it less to get a higher battery life in effect, which is rather like announcing your car will cost you less if you drive it like a saint.
It seems to me that, had a larger battery been used, which by many accounts was doable but some reason not, the saintly use to get acceptable battery life mightn't have been quite so strictly neccessary.
But thats just my view and I'm not looking for a debate on it.