BT-DN300 Battery Di2The Shimano Di2 BT DN300 Internal Battery has a waterproof design and provides neat interal housing within seatposts and frames. The SD300 ports can wire the front and rear derailleurs easily and effectively to the Shimano 12 Speed electronic systems. Features Waterproof, internal battery design 3 port for simplified wiring Stable power for 12 speed Di2 Compatible with SD300 wire
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