Shimano BT-DN300 Di2 BatteryThe DN300 battery maintains the waterproof design trusted by Di2 users while providing stable power to Shimano 12 speed road systems. Its slim profile allows it to be housed inside seat posts or frames to ensure a clean bike aesthetic. Now featuring three ports, the DN300 simplifies wiring to front and rear derailleurs. The additional port offers a fully wired option for riders seeking maximum redundancy, making it compatible with the next generation
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