f5 battery life is not poor. if you do good power management settings and use lowest screen brightment it lasts 6 hours on web browsing. in reviews peoples says f5 battery life 3 hours. i dont know what they do i think they use screen on full brightment.
i think its a feature for protecting the battery. mine is very very slow charging after 98. after 1-2 hour it gets 98 to %100 but its dont stop charging after %100. i dont know is it a problem?