Lenovo ThinkPad T420s, T420 And T520: Up To 30hrs Battery Life - SlashGear
Lenovo ThinkPad T420s Review | Digital Trends
Upgraded the twins today. T420 got 16gb ram and a sled battery. 9cell + sled = 17hrs battery life. T480 got an extra 16gb of ram, up to 32gb. Happy with the
Special price Laptop Battery for Lenovo ThinkPad E40 E50 T410 T410I T420 T510 SL410 SL510 - AliExpress