[jbmny]

I'd love to know too. I have a T530 from 2012. I ordered two replacement batteries from Lenovo's official supplier, and both bricked within a week of use. (Thankfully I was able to return both for full refunds.)

The machine still runs Linux like a champ -- I'd just like a new battery so I don't have to have it plugged into the wall at all times.

[justinclift]

If you can't find a suitable source, would it be feasible to replace the cells inside the replacement batteries instead?

Most replacement batteries seem like they use fairly "standard" cells, which aren't all that hard to obtain.