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https://www.laptopcloseout.com/lenovo-thinkpad-t420#:~:text=Highly%20mobile%2C%20ThinkPad%C2%AE%20T%20Series%20T420%20can%20stay,Battery%20Stretch%20lets%20you%20temporarily%20extend%20battery%20life.
https://notebooks.com/2011/02/21/lenovo-thinkpad-t420-details-specs-and-photos/
ThinkPad T420 Battery Life: The ThinkPad T420 is rated for 15 hours with the standard 9 cell battery, and can be extended to 30 hours using the T series slice battery which stacks on the bottom. Slice batteries add weight, but they don’t extend out the back of the notebook like many extended consumer batteries do.
https://www.slashgear.com/lenovo-thinkpad-t420s-t420-and-t520-up-to-30hrs-battery-life-21134836/
For extreme battery life needs, the ThinkPad T420 with its standard 9-cell battery and optional 9-cell slice battery provides up to 30 hours of computing power.
https://www.notebookcheck.net/Review-Lenovo-Thinkpad-T420-Notebook.51230.0.html
The Thinkpad T420 can practically be seen as an immediate opponent of the basically ... a battery life of up to 30 hours are supposed to be possible with the 9 …
https://www.laptopcloseout.com/lenovo-thinkpad-t420
Highly mobile, ThinkPad® T Series T420 can stay unplugged up to 30 hours and still deliver the performance you need!† Lenovo's Power Manager, less power-hungry displays, and the latest battery technology let you work wherever, whenever.
https://www.cnet.com/reviews/lenovo-thinkpad-t420-review/
With an attached nine-cell battery (for an extra $50), the Lenovo ThinkPad T420 lasted an impressive 7 hours and 22 minutes in our video playback test.
https://mostraturisme.com/best-t420/
Lenovo ThinkPad T420 Laptop PC, Intel Core I5 2520M up to 3.2GHz, 8G DDR3, 320G HDD. Port: Display Port, 34mm Express Card slot and SD Card reader, 1 Always-On USB 2.0 with yellow marking, 2 USB 2.0, 1 USB 2.0 Esata Combo 4 in 1 Card Reader; Operating System: Windows 10 Pro 64 Bit-Language Supports English/Spanish/French; Thinkpad T420
http://mperdikeas.github.io/travails-setting-up-T420.html.files/Detailed-specifications-ThinkPad-T420-Lenovo-Support.pdf
You can determine how much battery power remains by using the Fuel-Gauge ThinkPad utility program. This displays the percent charge remaining, whether one or two batteries are in the system. A 6- or 9-cell Li-Ion battery pack is shipped with the system. Supports optional Slice battery as second battery at bottom. Battery life: 6-cell: up to 3.5 ...
https://www.reddit.com/r/thinkpad/comments/q2w4np/t420_lives_again_on_windows_11/
Continue browsing in r/thinkpad. r/thinkpad. IBM and Lenovo ThinkPad laptop enthusiasts! 128k. Joined Thinkers. 596. Currently Thinking. Created Mar 25, 2009.
https://www.reddit.com/r/thinkpad/comments/pictwb/thinkpad_t420_or_t420s/
It isn’t great battery life but you might get it to run 4 hours. The T430 and T430s had a different keyboard that was decent but not the great experience on the 20 series. Many people have done modifications to put the keyboard onto the 30 series. So I would recommend T420, T430, and T430s. Avoid T420s.
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