I am doing fairly well in terms of battery life- I tend to get around 3 hours off one charge, generally with Wi-Fi enabled, which is very good indeed, in my opinion. However, by dimming the screen’s backlight, I can get even longer indeed- I’ve no scientific evidence for this, but, dimming to level 4 seems to increase battery life by about 30 minutes, which is not to be sneezed at…
To change backlight level, use the Function key and either F3 to decrease or F4 to increase.
