About Thinkpad's batteries. A bit off-topic being a hardware specific question but taking in care several people here say to use Thinkpads (and the cost of their batteries) I think it'll be useful for everyone to share our experience.
My experience with these laptops is short, I bought a refurbished x201 in Jan 2014 and a T420, second hand too, in Sep 2014. The first came with a *new* 9-cell lenovo original battery that lasts almost 6 hours long as who sold me had promised me. I received the T420 with a used 6-cell lenovo original battery that gave me barely 2 hours. I presumed it'd give me 6 like the x201 with a 9-cell one, so I bought through ebay a *supposed* "lenovo original" new 9-cell battery that suddenly *died* after 15 days of use :-). The vendor refunded me the money so the second time I bought some of those *trade-less* 9-cell ones you find in ebay. That's the one I have in use since Dec 2014. Initially it lasted ~4.5 hours, but now, after 7 months of use, it lasts no longer than 2 hours. As I told you my experience with these laptops (and laptops in general) is short so I don't know if I wasn't lucky or those in forums that assure these batteries can give *15 hours* did the test in suspended to RAM state :-). Did some of you get 15 hours from some of these batteries? If that's true, what tech specs should I take in care at time to buy a new one? Walter -- PLEASE, LET'S PRESERVE GOOD EMAIL PRACTICES - Use plain text (no HTML please). - Separate paragraphs with empty lines. - Use hard wrapped lines at no more than 72 columns. - Avoid top-posting. - You'll find the above easy to accomplish by using a decent email client (i.e. Thunderbird, Claws mail, Mutt).