Best suited to a customer replacing or installing the internal battery in a compatible EW-SD50 Shimano Di2 road or mountain-bike system.
The BT-DN110-A is a 50 g internal Di2 battery for compatible road and mountain bikes. Its cylindrical format can be installed inside a suitable frame or seat post, leaving the bike tidy while protecting the battery from everyday exposure. It uses one SD50 port and is intended for Shimano Di2 systems that use EW-SD50 wiring.
With a 7.4 V, 0.5 Ah Li-Ion cell, this battery supplies the power and system communication required by compatible Di2 components. It also acts as the Di2 master unit, supporting battery-level information and firmware updates through E-TUBE PROJECT. The battery is commonly specified for 11-speed R8000 and R9100 systems, but you should confirm that your existing setup uses EW-SD50 wiring before ordering.
Charging is handled through the compatible SM-BCR2 charger, connected via a junction [A] or system information display. Choose it as a replacement or upgrade for a compatible Di2 installation where a discreet internal battery, single-port connection and straightforward system integration are the priorities.
Internal installation
Fits inside compatible frames or seat posts for a clean, protected Di2 installation with no external battery visible.
EW-SD50 system connection
The single SD50 port integrates with compatible Shimano Di2 wiring and components.
Lightweight construction
At an average 50 g, it adds minimal weight to the bike.
Master-unit function
Supports Di2 system communication and battery-level information transmission as the system master unit.
Firmware-update support
Compatible system firmware can be updated through E-TUBE PROJECT.
SM-BCR2 charging
Charges with the compatible SM-BCR2 charger through a junction [A] or system information display.
Synchronized-shifting capability
The battery provides the processing support required for compatible Di2 Synchronized Shifting functions and custom shift patterns.
Compatibility check required
Confirm your bike uses Shimano EW-SD50 wiring; this battery is commonly listed for 11-speed R8000 and R9100 Di2 systems.
General
Electrical specifications
Connections
Dimensions & weight
Installation & compatibility
Operating and storage conditions
Service parts
Internal Di2 battery
The cylindrical battery fits inside compatible road and mountain-bike frames or seat posts, keeping the Di2 power source protected and out of sight.
Master unit
The battery acts as the Di2 system master unit, supporting system communication and battery-level information transmission.
E-TUBE PROJECT firmware updates
Use E-TUBE PROJECT to update compatible Di2 system firmware through the battery system.
EW-SD50 connection
The single SD50 port integrates the battery with compatible SHIMANO Di2 wiring and components.
Li-Ion battery chemistry
The lithium-ion construction provides the rechargeable power source for compatible Di2 systems.
