Description
- SM-BTR1 (70g) battery pack for Di2 electronic shifting systems (cradle/mount included with rear wire harness kit)
- Di2 External Battery, battery charger, and power cable are universal between Dura-Ace 7970, Dura-Ace 9070, Ultegra 6770 and Alfine Di2 systems
- Charger and 3-prong (USA) household plug/cord sold separately
- Must purchase all three parts for complete system
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