Lenovo ThinkPad T420 Review - Expert Critique by Itechguides.com
Lenovo ThinkPad T420 Review: Lenovo ThinkPad T420 review: A 14in business laptop with 2nd Gen Intel Core technology and great features - Notebooks - All Purpose - PC World Australia
Battery Life and Charge Time - The Lenovo ThinkPad X1 Carbon Review (2015)
Lenovo ThinkPad T420s Review
Lenovo ThinkPad T420s, T420 and T520: up to 30hrs battery life - SlashGear