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Shimano Di2 SM-BTR1 External Battery

This Lithium Ion battery for Shimano Di2 electronic shifting systems was developed as an external battery option for e-Tube wiring on frames without frame integrated / internal wiring options. This is the battery only, no mount or charger included. Shimano mount options, which have the e-Tube port and communications technology required.


  • External e-Tube compatible Di2 battery; reliable Lithium Ion power for Di2 systems
  • Designed to connect with mount for externally wired e-Tube systems
  • Incredibly durable, sealed composite housing
  • At full charge the battery can deliver up to/around 1000 miles of use
  • Battery only; mounting system and charger sold separately.
  • Weight: 70 grams
  • Shimano part# ISMBTR1A

All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions.

Sale Price
Reg Price $69.95
Available on 6/15/2020