Shimano BT-DN300 Built-In DI2 Battery

Shimano BT-DN300 Built-In DI2 Battery - For Dura-Ace 9250 and Ultegra R8150 Systems Shimano

Shimano BT-DN300 Built-In DI2 Battery

Shimano BT-DN300 Built-In DI2 Battery

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What Is the Shimano BT-DN300 Di2 Battery and How Does It Charge?

The Shimano BT-DN300 is the built-in Di2 battery for Dura-Ace R9250 and Ultegra R8150 12-speed electronic groupsets, designed to mount internally in the seat post or frame and charge in-frame via the EW-EC300 USB-C cable without removal. This is a significant improvement over previous Di2 battery designs that required removing the battery for every charge -- with the BT-DN300, you connect a USB-C cable to the charging port on the derailleur body and charge from any USB-C power source. The battery capacity is rated for approximately 1,000 to 1,500km per charge depending on conditions.

Compatible with Shimano Dura-Ace R9250 and Ultegra R8150 Di2 12-speed groupsets. Charges via EW-EC300 USB-C cable (sold separately). Installation location varies by frame -- seat tube or downtube mounting. Verify compatibility with your specific frame before ordering.

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Specifications

  • Model: BT-DN300
  • Type: Built-in Di2 battery (internal mount)
  • Charging: USB-C via EW-EC300 cable (sold separately)
  • Compatible Systems: Shimano Dura-Ace R9250 and Ultegra R8150 Di2 12-speed
  • Range: Approx. 1,000-1,500km per charge
  • Mount: Internal (seat tube or downtube, frame-dependent)

FAQ

Do I need to remove the BT-DN300 to charge it?

No. The BT-DN300 charges in-frame via the integrated port at the derailleur body using the EW-EC300 USB-C cable, eliminating the need to remove the battery.

Is the BT-DN300 compatible with older Di2 systems?

No. The BT-DN300 is designed for Shimano 12-speed Di2 only. Older Di2 groupsets use different battery formats and connectors.

How do I know if my frame is compatible with the BT-DN300?

The BT-DN300 requires a frame with an internal Di2 battery mount -- either a seat tube or downtube cavity sized for the BT-DN300 form factor. Check your frame manufacturer's Di2 compatibility documentation before ordering.

Best For

Riders building or replacing the battery in a Shimano Dura-Ace R9250 or Ultegra R8150 Di2 12-speed system on a compatible internally-routed frame.

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