When it's time to top off our Di2 system, we turn to the Shimano EC-DN100 Charger for fast, reliable power. Compact and simple, this charger is built specifically for Shimano's DN300 and DN110 internal batteries, delivering stable charging through the SD300 connection. Its small size makes it easy to travel with or keep tucked into a toolbox, and it integrates seamlessly with Shimano's latest 12-speed Di2 systems. Whether prepping for race day or post-ride maintenance, the EC-DN100 keeps our shifting system ready for whatever's next.