Batt life is 300 (dpreview). Many of us use 2nd batt, from Eastgear.
EVF is not as bright as optical view finder. No big diff from LCD panel. I use it rarely, only when sunlight is very bright and LCD got washout. (it cannot use optical bcos of it's super zoom)
The new fz7 has a useful improvement over fz5, better lcd. Worth waiting....