Shimano Di2 Internal Seat Tube Battery SM-BTR2-1

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  • Resides within seatpost, seat tube, or down tube
  • Fully-sealed 7.4-volt lithium-ion rechargeable battery
  • Comes with seatpost assembly mounting hardware
  • E-Tube Cockpit Junction Box, SM-BCR2 battery charger not included
  • 600 to 1,500-mile range
  • 1.5-hour recharge time