Using tin can increase the energy storage capacity of a battery cell by nearly three times, he said.

FORBES: Tin: The Secret To Improving Lithium-Ion Battery Life

The X-Slim series notebooks weigh just 2.8 lbs, but come loaded with the most storage space and the largest battery (4-Cell) in their class.

ENGADGET: MSI outs full specs of X-Slim X320 / X340 and Wind U123

The updated model doubles the memory to 4GB RAM, expands the hard drive storage to 320GB, and packs a 6-cell battery with a rated life of 6 hours.

FORBES: Acer Upgrades C7 Chromebook With Improved Battery, More Memory