Shimano SM-BTR1 Di2 External Battery - ISMBTR1A
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Shimano SM-BTR1 Di2 External Battery - ISMBTR1A, This is the Shimano SM-BTR1 Di2 Battery. Features: Di2 External Battery, battery charger, and power cable are universal between Dura-Ace 9070, 7970, Ultegra 6870, 6770 and Alfine Di2 systems Weighs only 71g Lasts around 1,000 miles on average Specifications: Type: Lithium Ion Nominal Capacity: 530 mAh Weight: 71g Operating Temperature Range: -20 - 60degC (when discharging), 0 - 45degC (when charging) Storage Temperature Range: -20 - 60degC Nominal Voltage: 7.4V