Shimano Di2 Bt-Dn110-A Battery(Only)

Shimano Di2 BT-DN110-A Battery (Internal / Seatpost Type)

What Is It?

The Shimano BT-DN110-A is a lithium-ion internal battery used in Shimano’s Di2 electronic shifting systems (road, MTB, and gravel).

It powers the front and rear electronic derailleurs, replacing traditional cables with fully electronic shifting. The “A” version is a revised, more robust design of the original BT-DN110.

It is typically installed inside the seatpost, frame, or frame-mounted holder.

Key Features

• Powers Shimano Di2 electronic shifting systems
• Internal mount design (seatpost or frame integration)
• Compatible with 11-speed Di2 systems (and some 10-speed setups)
• Lightweight and compact cylindrical design
• Long-lasting charge (often up to ~2000 km per charge depending on use)
• Rechargeable lithium-ion technology
• Works with Shimano E-Tube system for diagnostics and updates
• Can be used with Bluetooth/diagnostic interfaces (via compatible units)

Specifications

How It Works

$y = e^{-kt}$
The battery stores electrical energy and gradually releases it to power the shifting system. Each shift uses a small amount of energy, and overall battery life depends on usage frequency, temperature, and system efficiency. Recharge cycles follow a slow capacity decay curve over time, which is normal for lithium-ion batteries.

Who Is It Suitable For?

• Road cyclists using Shimano Di2 electronic groupsets
• Gravel riders with Di2 setups
• XC MTB riders using Di2 systems (older XTR/XT Di2)
• Performance cyclists wanting electronic shifting
• Riders upgrading from mechanical to electronic drivetrains

Who Should Use It?

• Riders with Shimano Ultegra Di2, Dura-Ace Di2, XTR Di2, or XT Di2 systems
• Cyclists needing a replacement internal Di2 battery
• Performance road and gravel riders
• Riders who want consistent, low-effort shifting
• Bike mechanics servicing electronic Shimano drivetrains