Upgrading Windows XP /Vista Laptops to Windows 7 lower battery life

Notebook owners upgrading their Windows XP and Windows Vista machines to Windows 7 are complaining that Microsoft's new OS has severely reduced their available battery life. One user tells The Reg that after upgrading his circa 2007 HP notebook from Vista to Windows 7, the machine's battery life dropped from two hours to a half […]

Notebook owners upgrading their Windows XP and Windows Vista machines to Windows 7 are complaining that Microsoft's new OS has severely reduced their available battery life. One user tells The Reg that after upgrading his circa 2007 HP notebook from Vista to Windows 7, the machine's battery life dropped from two hours to a half hour, and countless others are voicing similar complaints on Microsoft's TechNet forums. “The problem is caused by a new tool designed to alert users when their battery needs replacing. In some cases, according to TechNet posts, this alert appears time and again - even as a battery continues to run as it always did - falsely warning that the machine may suddenly shutdown. But in other cases, the machine does shutdown prematurely. It would seem this occurs well before the battery has run out of juice.” Microsoft has acknowledged the issue, saying it's related to the way Windows 7 reads system firmware. "We're investigating this issue in conjunction with our hardware partners," the statement reads. "The warning received in Windows 7 uses firmware information to determine if battery replacement is needed. We're working with our partners to determine the root cause and will update the [Technet] forum with information and guidance as it becomes available."