Just for your information. See this post:
Those codes you mentioned (k-kj xx)are not "chargers", but charger sets, see my link above. Chargers are coded with BQ CC.
And the bq cc23 you said to be hard to get, is nothing special. And not more difficult to get than any of the other ones. So I don't k ow where you got that info from? Did the seller say that? The be bq cc21 is the better one of all. And the bq cc11 is probably the newest.
If you want to know more, look at the eneloop overview thread, or my sales thread. Most people here weren't really interested in chargers (sets).
Both threads linked in my Sig.