BT-DN110

Brand: Shimano

The reference internal battery of 11-speed Di2, introduced with the Dura-Ace R9150 generation. Shimano quotes 500 mAh at 7.4 V for 50 g, charging in about 1.5 hours from a USB mains adapter through the SM-BCR2, and a single E-Tube SD50 port. Unlike the SM-BTR2 it replaces, it is the system's master unit and accepts firmware updates. The -1, -2 and -3 suffixes change nothing technically: they distinguish recycling marking and the Korean market.