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If you want to be able to see the gear you are in you can use the Alfine or XT/XTR Di2 one
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
PhilDAS-
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.
amey
https://www.sigmasports.com/item/Shimano/SW-R600-Climbing-Shifter-Switch-For-Drop-Bar-Right-Hand/3B97?
For shifting you can also use XT Di2
https://www.bikeparts.co.uk/products/shimano-sm-ew90-a-e-tube-di2-junction-a-3-port?
If you want to be able to see the gear you are in you can use the Alfine or XT/XTR Di2 one.
1 short cable from shifter to junctionbox at stem/handlebar
1 long cable from junction box A (stem) to junction box B (https://www.sigmasports.com/item/Shimano/SM-JC41-Di2-Internal-Cable-Junction/WI9)
1 cable from junction box B to battery (length depends on where the batt will go)
1 cable from junction box B to alfine motor unit
This is the external battery: https://www.probikekit.co.uk/cycling-electronic-components/shimano-di2-sm-btr1-battery/10781871.html?
It comes in 2 or 3 mount options depending where you want to mount on the frame; https://www.wiggle.co.uk/shimano-bm-dn100-battery-mount?