Shimano SM-BTR1 External Battery Di2SM 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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