Batteries (almost) included

One of the main problem with modern smartphones (and the 5800 is one of them) is the duration of batteries: if you use GPS, WiFi, and so on you can find that your battery does not last enough to finish the day. In An Exhaustive Guide to Saving Your Smartphone’s Battery they give some hints to improve battery life. But you shouldn’t be very optimistic: they way  of saving it is to avoid the ’smart’ part of the phone. Unfortunately, there are nor many hints about Symbian phones. Anyway, most of the ideas are operating-system independent.