If you are a Windows 7 user on laptop you might have been bugged with a an alert saying “Consider replacing your battery”  users who have  upgraded from eg. Windows XP or Vista to Windows 7, have seen to get the message “Consider replacing your battery.”
The message is a new feature in Windows 7, which is triggered if the capacity of the battery is less than 40% of its original capacity, although it is fully charged.
On several websites and blogs, it was speculated that it was Windows 7, which caused the “error” because the computer after all worked fine before the upgrade. That Microsoft has now declined in a blog post on MSDN.
Microsoft states that they have investigated several of these situations and it has all of them proved that the battery was actually below 40% of its original capacity left.
In addition, stressed that information on the battery capacity is a read operation via ACPI why Windows 7 is in no way can affect the battery, so it leads to error, as some have speculated in.
