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It is not compatible with certain batteries though so may not work with the external one
Good point, have a look at this too corny: https://bike.shimano.com/content/dam/e-tube/assets/images/contents/project/compatibillity/pdf/en/HM-CC.3.4.3-00-EN.pdf
I had one of those too on a 1x11 setup and then had Alfine Di2, being able to see what gear you are in is very useful for Alfine.
I have one of these I'll realistically never use.
It is not compatible with certain batteries though so may not work with the external one