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
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Lenovo ThinkPad T420 Battery (6 Cells)
Lenovo ThinkPad T420 Battery
ThinkPad Battery 70+ (6 cell) and ThinkPad Battery 70++ (9 cell) - Overview - Lenovo Support ZA
Lenovo ThinkPad T420 Review - Itechguides.com
Lenovo ThinkPad T420 Battery Replacement | LenovoBatt.com
Lenovo ThinkPad T420s, T420 And T520: Up To 30hrs Battery Life - SlashGear
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