Revamped ThinkPads claim up to 30 hours of run time

Sandy Bridge is coming to Lenovo's famous Thinkpad line—albeit not immediately. Lenovo has announced six new ThinkPads powered by Intel's new generation of processors, and it says they'll be available "starting in March" from its partners and from its own online store .

These six new systems are the ThinkPad T420, T420s, T520, L420, L520, and W520. Lenovo's announcement doesn't delve into specifications for the most part. Knowing the firm's naming scheme, however, we can guess the 420 and 520 model numbers allude to 14.1" and 15.6" display sizes. As for the single-letter prefixes, Lenovo defines them on this page; L denotes easy-to-use business laptops, T signals a blend of performance and portability, and W designates mobile workstations.

The ThinkPad T420s. Source: Lenovo.

The star of the new family looks to be the T420s, which Lenovo provides a few details about. It's "ultra-thin," weighs less than four pounds, features Nvidia Optimus switchable graphics technology, and can purportedly achieve 15 hours of run time with one nine-cell battery and up to 30 hours with a second, nine-cell "slice" battery. Impressive if true... although published battery life ratings are usually a tad over-optimistic.

Despite skirting around exact specs, Lenovo does quote pricing for the upcoming ThinkPad series. The T420 and T420s will cost $779 and $1,329, respectively. The T520 will set you back $909, and both the L420 and L520 will start at $719. Finally, Lenovo will charge $1,329 for the ThinkPad W520.

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