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The Shimano Di2 BT-DN300 Battery features a slim, waterproof design to power your D12 electronic shifting experience. It has three ports to simplify wiring to front and rear derailleurs, supplying stable power at all times. Bzzt bzzt!
3 SD300 Ports
Compatibility – Compatible with thinner next generation electric wire SD300 and systems after R9250/R8150 series.