Shimano SM-BTC1 External battery case for SM-BTR2 – Black

The Shimano SM-BTC1 External battery case for SM-BTR2 is a genuine Shimano replacement part for Shimano road Di2 groups. This battery case mounts current SM-BTR2 batteries externally next to your bottle cage. It has a low profile design which allows it to mount with any bottle cage and bottle and also acts as a cable organizer allowing you to keep your bike looking neat and tidy.