The Shimano Di2 SM-BMR1 battery mount is the long version that attaches to one of the water bottle mounts on the down or seat tube of your frame. It is available in two versions, one for internal cable routing and another for external cable routing.
Battery sold separately
Attaches to Di2 frame
Manufacturer Part #: ISMBMR1IB (internal) or ISMBMR1LB (external)
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