On it's UK support forum, Nokia has confirmed that the brand new Nokia Lumia 800 Windows Phone has some (serious) battery problems and confirmed that the company will release two patches which are said to fix the problems. According to Nokia's statement, "a software update in early December will include improvements to power efficiency, while a second update in early January introduces further enhancements to battery life and battery charging. Both are planned updates and will be made available via Zune". Furthermore, the company has released a couple of support information regarding the optimization of battery life in general as well as tips for users of Nokia Drive.
However, these general tips to optimize the battery life are typical tips to generally improve the battery life of any mobile phone and include as valuable tips like "turning off Bluetooth if not needed", "lower the display backlight brightness level" as well as this very useful tip to "switch off your phone whenever you don't plan to answer any calls, for example, while you are sleeping"!
Hopefully the patches are released soon that Nokia Lumia 800 users will be able to let their phone turned on, even if they don't plan to answer phone calls (but awaiting a text message)!
Cheers ~ Arne