I'm confused. If this was what you were going to reply with, why on Earth did you bother asking the question?

Anyone who's even remotely techy knows why their smartphone battery lasts far less than a day on average. That doesn't mean that they're happy with the (often fashion driven) tradeoffs made by phone designers, or that they don't actually want a vaguely-smart-phone that also has battery life of a week or more.