Windows 7 Laptop Battery Issues
Due to a growing amount of chatter on blog sites and the like, Steve Sinofsky, President of the Windows and Windows Live divisions at Microsoft – Head of Windows 7 has posted on the Engineering Windows 7 Blog about the problems.
http://blogs.msdn.com/e7/archive/2010/02/08/windows-7-battery-notification-messages.aspx
Having been a user of Windows 7 since Build 7000 – The first Beta, I have had no such problems with the batteries as a result of Windows 7, but as a result of the batteries themselves.
I use a Dell Latitude D630 which is about 18 months old now. From new, I could get about five hours usable battery life from my extended life 9-Cell Dell battery, however over time (While running XP and Vista) this degraded to about three hours as is to be expected when the laptop is connected to a docking station for the majority of the day. The battery continued to worsen and it got down to about two hours before Build 7000 became available.