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The Lenovo ThinkPad T420 and T420s
The 14-inch ThinkPad T420, pictured to the left of a T420s, comes with a particularly hefty claim from Lenovo — the company said it will run for up to 30 hours with the extended 'slice' battery.
Slice batteries are large extra batteries that fit onto the underside of the laptop. Lenovo bases its 30-hour claim on the combined use of the standard 9-cell battery and the 9-cell slice battery.
Both the T420 and its slightly larger sibling, the 15.6-inch T520, have display resolution options of 1366 x 768 pixels or 1600 x 900 pixels, while the larger model also comes with a full-HD 1920 x 1080-pixel resolution.
The T420 weighs 2.24kg and the T520 2.52kg. The T420 has a launch price of £845, as does the T520.