This review is from: Thinkpad Battery 55++ (9 Cell) (Personal Computers)
I had purchased the 6-cell battery along with my T420, and while it was light and portable, it wasn't enough to make it through the business day. I upgraded to this 9-cell and it gives between 7-10 hours of use depending on what I run, which means I can do a full business day without needing a plug nearby. And it doesn't add much to the size and weight (plus it also fits fine with my mini-dock). The 6-cell is now demoted to backup battery.
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