Microsoft has denied suggestions that Windows 7 has been causing various battery issues with notebooks, according to a Microsoft Developer Network blog post. The company allegedly worked through a series of tests to determine if the operating system was mistakenly presenting the "consider replacing your batteries" warning. The engineers claim that, in each of the testing scenarios, the notification was only presented if the battery was actually performing below certain standards.

"To the very best of the collective ecosystem knowledge, Windows 7 is correctly warning batteries that are in fact failing and Windows 7 is neither incorrectly reporting on battery status nor in any way whatsoever causing batteries to reach this state," the post reads. "In every case we have been able to identify the battery being reported on was in fact in need of recommended replacement."

The battery warnings are said to be based on a reduction in the Watt-hours power capacity. Windows 7 uses a threshold of 60 percent degradation, causing the warning if the battery is only performing at 40 percent of its designed capacity.

Many users became concerned when upgrading to Windows 7, as the battery warnings never appeared on XP or Vista. Microsoft claims the lack of prior notifications does not mean the latest OS is causing a problem, however, as the previous versions of Windows simply lacked the new notification system.

"We’ve gone through all the major online support and self-help forums and when appropriate have worked to follow up with any reports of this notification being presented in error," the blog claims. "Through this we have identified no reproducible cases where the battery or PC was new and have only learned of batteries that were degraded in capacity." [via CNET]