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Shimano BT-DN300 Built-In Type Di2 Battery [SD300 Type] Socks enhancing the performance and longevityThe Shimano BT DN300 Built In Type Di2 Battery is engineered to deliver consistent and reliable power to Shimano's latest 12 speed Di2 systems. Its internal mounting design ensures a clean look and seamless integration with modern road bikes. Three Port Configuration for Flexible Wiring: With three SD300 ports, the BT DN300 makes it easier to wire both front and rear derailleurs while also supporting a fully wired option. This added flexibility allows
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