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Shimano BT-DN110-A Di2 Battery Description: The Shimano BT-DN110-A Built-In Type Di2 Battery is the power source for Shimano's 11 speed Di2
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Shimano Di2 Batteries. Must purchase battery, charger, and power cable to complete the system. All Di2 components on the bicycle require the same firmware version.
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Shimano BT-DN300 Built-In Type Di2 Battery [SD300 Type] – Supreme