One of the main problems of smartphones today seems to be the rather poor battery life - thanks to the amount of sensors, components and big screens. It's also one of the downsides of Nokia's Lumia 800, but here's a few tips for a little longer battery life based on my own experiences:- Turn off background tasks on as many apps as possible (Settings -> applications -> background tasks). You should also check out applications' own settings since many have multiple options for using network data and push notifications (e.g. the Facebook app)
- Reduce push email frequency (Settings -> email+accounts -> select account -> Download new content)
- Turn off 3G if you don't surf the web much (Settings -> mobile network -> Highest connection speed). This has had surprisingly big impact on the battery life, especially on days when I don't use the phone much.
- Turn off Wi-Fi if you don't have wireless networks at home or work (Settings -> WiFi). Otherwise I like to keep it on, since I haven't noticed it wasting huge amounts of battery charge (might depend heavily on the amount of surfing and downloading, though).
- Turn on Flight mode during the night (if you don't expect or WANT to receive calls) =) This has been the most effective power saver (guess it's basically the same as built-in battery saver mode, except you can turn on Wi-Fi etc. while on Flight mode)
Nokia Care (@NokiaHelps via Twitter) also hinted that I should make a backup of my phone and then reinstall it. I did that and ever since the phone has performed better than before and hasn't had any of those sudden deaths, e.g. battery dying overnight. So that is something you might also want to try if Nokia's own firmware updates via Zune or Windows Phone Connector on Mac haven't helped on battery life oddities.
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