3 ms·

I have a t420s, and replacing the DVD with a bay battery was a very worthwhile trade.

• saosebastiao 12y ago
  Do you have any links to these batteries? I'm very interested.
  • desdiv 12y ago
    Try the keywords "ultrabay slim battery".
  • lorenzhs 12y ago
    IIRC they only work with the T420s, not the T420. I might be wrong though, but Lenovo definitely removed the connectors that are required for that in some models of the T series at some point in time...