The Shimano BT‑DN110‑A is a compact, waterproof lithium-ion battery designed for internal mounting (e.g., in seatposts or frames) in Shimano Di2 electronic shifting systems. It powers the E‑Tube network, enabling reliable wireless firmware updates, synchronized shifting, and robust performance even in harsh riding conditions.
Features
Internal mountable in seat post, frame, steerer tube, etc.
Waterproof and rugged E‑Tube connector design
Compatible with Shimano’s SM‑BCR2 charger – no need to dismount frame
Enables wireless firmware updates and Synchro‑Shift
Long-range: ~1,000–2,000 km per charge depending on usage
Supports Bluetooth LE diagnostics and customization
Comes with mounting adapters, washers, snap‑ring, and collar
