Shimano BT-DN300 – Internal Di2 Battery for 12-Speed Electronic Shifting
The Shimano BT-DN300 is a rechargeable internal lithium-ion battery designed to power compatible Shimano Di2 electronic shifting systems.
Featuring three compact SD300 connection ports, the BT-DN300 supplies power to compatible front and rear derailleurs while supporting Shimano's electronic drivetrain configurations.
Its slim design allows installation inside compatible bicycle frames or seatposts, maintaining a clean appearance without an externally mounted battery.
The BT-DN300 is compatible with selected Shimano Dura-Ace, Ultegra, 105 and GRX 12-speed Di2 systems.
Key Features
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Internal Di2 battery: Designed for integration inside compatible frames or seatposts.
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Three SD300 ports: Provides connections for compatible Shimano E-TUBE components.
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Lithium-ion technology: Rechargeable battery designed for electronic shifting.
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500 mAh capacity: Rated energy capacity of 3.7 Wh.
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7.4 V nominal voltage: Provides power to compatible Di2 components.
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Compact design: Shares its mounting method with the previous BT-DN110 battery.
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Genuine Shimano component: Designed for reliable integration with compatible Di2 systems.
Technical Specifications
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Brand: Shimano
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Model: BT-DN300
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North American manufacturer part number: IBTDN3002
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Product type: Internal rechargeable battery
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Battery chemistry: Lithium-ion
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Nominal voltage: 7.4 V
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Rated capacity: 500 mAh
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Energy capacity: 3.7 Wh
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Connection standard: Shimano SD300
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Number of SD300 ports: 3
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Number of SD50 ports: 0
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Average weight: 52 g
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Application: Compatible Shimano Di2 electronic shifting systems
Shimano Di2 Compatibility
According to Shimano's compatibility documentation, the BT-DN300 works with supported 12-speed Di2 systems, including:
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Shimano Dura-Ace R9200: RD-R9250 / FD-R9250
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Shimano Ultegra R8100: RD-R8150 / FD-R8150
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Shimano 105 Di2 R7100: RD-R7150 / FD-R7150
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Shimano GRX RX825 Di2: RD-RX825 / FD-RX825
Compatibility must be confirmed using the exact component models and Shimano E-TUBE configuration.
SD300 Connections
The BT-DN300 features three SD300 ports, allowing compatible electronic shifting components to be connected using Shimano EW-SD300 electric wires.
It does not have native SD50 ports. Older SD50 components require verification of compatibility and may need a Shimano EW-AD305 conversion adapter in supported configurations.
Charging and Installation
In compatible systems, the battery is charged through the rear derailleur using the Shimano EW-EC300 charging cable.
Follow Shimano's installation and battery-handling instructions. Confirm the mounting location, cable lengths and compatibility before installation.
Note: This product is the BT-DN300 battery. Charging cables, electric wires and drivetrain components are separate items unless explicitly included in the product package.
