My current battery is model 45N1171, but according to www.lenovo.com/support/batteries I want 43R9254 now?
I mean, so long as it's compatible, provides around 63 Wh, and doesn't explode, I don't care what letters it uses...
But I also don't understand why larger stores don't bother stocking batteries.
Also [insert disposable electronics rant].
(If there are devices where it's more complex than changing the hard-drive, that's probably a good reason to avoid that manufacturer entirely.)