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The Shimano Battery Case Bottle Cage Mount SM-BTC1 mounts Shimano's SM-BTR2 battery (not included) on a bike's water bottle bosses and also acts as a Junction B, connecting wires from the shifters to the battery and derailleur. The SM-BTC1 mount also acts as a cable organizer, keeping your bike looking tidy. Shimano Di2 BTR2 battery sold separately.