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Shimano Di2 Battery Mount
Shimano

Shimano BMDN100 Di2 Long Battery Mount for External Wiring

Type: Electronic Shifter Parts
$160.00
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Shimano Di2 External Battery Mounts
All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/