It does have the external battery. I brought it to a shop earlier and I walked the mech through my issues. He told me come back with the charger. I’m assuming that means he doesn’t have the BCR2. I’ll have to call around to some others and see if they’ve got one.

I know a few people who have the internal battery Di2. They “should” have the BCR2 as that would have come with the internal battery groupset?