Lubavitch minhag calls for the tefillin battim to be 4 x 4 cm based on the Baal HaTanya's ruling in the Shulchan Aruch HaRav, 32:63. Are there any other communities who have the minhag to use Chabad-sized battim or is this exclusive in Lubavitch?
Normal-sized battim are 3.5 x 3.5 cm or sometimes smaller, and I believe this is based on the Shulchan Aruch of Rabbi Yosef Karo, but I'm not sure.
Obviously, I don't expect there to be any non-Chasidic communities who use these "oversize" battim but surely there must be some Chasidic dynasties which use them as well.
I am specifically looking for a community's custom, not "there's a guy at my shul who wears Beis Yosef tefillin with Chabad battim" or anything like that.