The Shimano BT-DN110-A is the internal lithium-ion battery that powers Shimano's E-Tube Di2 electronic shifting systems across road, gravel and mountain bike platforms. Slim and cylindrical, it mounts discreetly inside a compatible seatpost or frame battery mount, keeping your cockpit and frame clean while delivering enough power for up to 2,000 km of shifting between charges.

Highlights

  • Compact internal design: Cylindrical 17 mm × 160 mm profile slots neatly into seatposts or frame-integrated mounts for a clean, cable-tidy build.
  • Extended range: 7.4V / 500 mAh (3.7 Wh) capacity delivers an estimated 1,000–2,000 km of shifting per charge depending on terrain and front derailleur usage.
  • Smart low-battery protection: When power drops critically low, the system locks the front derailleur while preserving rear shifting, so you're never stranded mid-ride.
  • Synchronized Shifting ready: Onboard processing chip enables Shimano's Synchronized Shifting and Semi-Synchro modes across compatible groupsets.
  • Fast charging: Reaches full charge in approximately 90 minutes via a USB adapter supplying at least 1A, or around 3 hours via a standard computer USB port.
  • Firmware upgradeable: Update Di2 firmware and customise shifting via the Shimano E-Tube Project app (EW-WU101 or SC-MT800 wireless unit required for wireless updates).

Charging

The BT-DN110-A charges via the SM-BCR2 battery charger, which connects through the Di2 junction box. Charging time is approximately 90 minutes from a USB power adapter providing at least 1A, or around 3 hours from a standard computer USB port. The E-Tube Project app displays current battery level in real time when connected to a compatible wireless unit.

Compatibility & Fit

Compatible with Shimano 10- and 11-speed E-Tube Di2 systems including Dura-Ace R9150, Ultegra R8050, 105 R7150, XTR M9050, Deore XT M8050, GRX RX815, and Alfine/Nexus Di2 internal hub systems. Not compatible with first-generation Di2 systems that pre-date the E-Tube architecture. Connects via a single EW-SD50 port. Can be mounted externally using the optional SM-BTC1 bracket. Charger sold separately (SM-BCR2).

Shimano offers a limited warranty covering defects in materials and workmanship. For warranty support, return the item to Tune Cycles.
  • Internal lithium-ion Di2 battery in a compact 17 mm × 160 mm cylindrical form factor
  • 7.4V / 500 mAh (3.7 Wh) capacity — up to 2,000 km of shifting per charge
  • Fits inside compatible seatposts or frame battery mounts for a clean build
  • Smart low-battery mode locks front derailleur to preserve rear shifting
  • Synchronized Shifting and Semi-Synchro capable via onboard processing
  • Charges in ~90 minutes via SM-BCR2 charger and 1A+ USB adapter
  • Single EW-SD50 port connection to the Di2 E-Tube network
  • Firmware upgradeable via Shimano E-Tube Project app
  • Compatible with Dura-Ace, Ultegra, 105, XTR, Deore XT, GRX, Alfine and Nexus Di2 systems
Part NumberBT-DN110-A
Battery TypeLithium-ion (internal/built-in)
Voltage7.4V
Capacity500 mAh (3.7 Wh)
Weight50 g
Diameter17 mm
Length160 mm
Port1 × EW-SD50
Charge Time~90 min (1A+ USB adapter) / ~3 hr (computer USB)
Compatible ChargerSM-BCR2
Speed Compatibility10 / 11-speed Di2 E-Tube systems
ColourGrey
SKU SHM-IBTDN110A2
Barcode # 4524667329046
Brand Shimano
Shipping Weight 0.3000kg
Shipping Width 0.150m
Shipping Height 0.120m
Shipping Length 0.550m
Shipping Cubic 0.001000000m3
Unit Of Measure each

Must be installed and serviced by qualified bicycle mechanic

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