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The Shimano Di2 BT-DN300 Internal Battery for R8100/R9200 maintains the beloved waterproof design and compact size of its predecessor, allowing for discreet internal housing within seat posts or frames. Now featuring three SD300 ports, this battery simplifies wiring to front and rear derailleurs, ensuring stable power delivery to Shimano’s 12-speed road derailleurs and shifters, with the third port offering a wired option for enhanced redundancy.