Shimano Di2 SM-BCR1 Battery Charger

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From Performance Bike

This is the Shimano Di2 SM-BCR1 Battery Charger for Di2 electronic shifting systems with a removable battery. Features: Di2 battery, battery charger, and power cable are universal between Dura-Ace and Ultegra Di2 systems Di2 Battery Charger (CY7972) does not include a power cable; must be purchased separately (CY7973) All Di2 components on the bicycle require the same firmware version.