Apple's long-awaited Penryn-based systems were released this morning, boasting faster clock speeds, more powerful graphics systems and multi-touch trackpads. Unfortunately, according to Italian technology web site, setteB.it, the units may lose as much of an hour or more of operating time when running from the battery.

The loss seems likely attributable to higher clock speeds (exact changes depending on the MacBook's specs), although the new MacBook now operates at 55 watts and provides 4.5 hours of runtime with AirPort functionality enabled as opposed to six on the previous model.

In the case of the 15.4" MacBook Pro, which is rated to operate at 60 watts, battery run times shrink from six hours to five hours. For the top of the line 17" MacBook Pro, which operates at 68 watts, battery run time diminishes from 5.75 hours to 4.5.

Updated: Apple has stepped forward to comment that the setteb.it web site's comments may be inaccurate as to a decrease in the battery life between the MacBook and MacBook Pro models released today and previous generations.

The company has since offered the following battery life numbers:

We'll have more information on this when the units go through a formal review and firmware updates may help lengthen battery life. In the meantime, let us know what you think over in the comments or forums.