Battery life of the FSC Amilo is OK but not exceptionally good. Especially from a sub notebook I would expect a little more working time when using the battery. This does not represent a scientific test, it is just about my experiences when working with this notebook.
Windows Vista
With the WLAN on and the screen on the highest brightness the laptop will not survive 3 hours (approx. 2:45 hours), without WLAN and a dimmed screen battery life can be prolonged. In this case it will last about 3:15-3:30 hours.
Ubuntu 7.04
My impression is that with Linux battery life is slightly better. With WLAN and a bright screen I can work for about 3 hours, when I dim the screen and switch of WLAN this goes up to 4 hours (3:5o – 4:00).
When I have more information on this or something has changed I will update this. Please do not forget, this is not an objective test, but my subjective impression.