What is the Shimano BCR2 Di2 battery charger for?

The BCR2 is Shimano's charger for internal Di2 batteries, specifically designed to charge the BT-DN110 and compatible internal Di2 battery units via a direct connection port. A dedicated charger is required for internal Di2 batteries as they cannot be charged through the standard EW-EC300 USB charging cable used with newer-generation Di2 systems. The BCR2 is the correct charging solution for older Di2 builds using internal battery configurations that predate the USB-C charging standard.

Compatible with Shimano BT-DN110 internal Di2 battery and compatible internal battery units. Not compatible with BT-DN300 or newer external Di2 batteries. Verify your Di2 battery model before ordering.