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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. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/
Shimano BT-DN110-A7 Di2 Battery - Built-In Type North American Spec
$200.00 USD
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