External Battery Mount (deprecated)

External Battery Mount (deprecated)

Non-series components SM-BMR1 / SM-BMR2

This Shimano SM-BMR1 / SM-BMR2 external battery mount was used with the SM-BTR1 external Di2 battery all the way until Shimano released the updated BM-DN100 battery mount.

Just like the later model, the older BMR1 / BMR2 come in different sizes, a long and a short version. Which one you need depends on your frame mounting options.

The short (-S) version is generally mounted underneath the bike, below the chain stay for example.
The longer -L version usually screws into the down tube bottle cage holes and allows you to install a bottle cage and an external battery.

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