Shimano BT-DN300 Di2 Internal Battery for R8100/R9200 - Pedal Passion

Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200

$189.99 AUD
Skip to product information
Shimano BT-DN300 Di2 Internal Battery for R8100/R9200 - Pedal Passion
  • Shimano BT-DN300 Di2 Internal Battery for R8100/R9200 - Pedal Passion
  • Shimano BT-DN300 Di2 Internal Battery for R8100/R9200
  • Shimano BT-DN300 Di2 Internal Battery for R8100/R9200 - Pedal Passion
  • Shimano BT-DN300 Di2 Internal Battery for R8100/R9200
Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200

Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200

$189.99 AUD
Taxes included. Shipping calculated at checkout.

The Shimano BT-DN300 Di2 Internal Battery is the compact, reliable power source for Shimano’s latest 12-speed electronic drivetrains, delivering clean internal integration, stable shifting performance and long-lasting battery life for road, gravel and performance riders across Brisbane, Queensland and Australia.

BT-DN300 Features

  • Genuine Shimano internal Di2 battery for modern 12-speed electronic drivetrains
  • Compatible with Shimano SD300 wiring systems used on R9200, R8100, R7150 and selected GRX Di2 groupsets
  • 3 SD300 ports for simplified wiring to front and rear derailleurs, plus optional wired cockpit setups
  • Slim internal design fits inside compatible seatposts, frames or dedicated battery mounts
  • Reliable lithium-ion power for smooth, precise Shimano Di2 shifting

(more product details...)

SKU: BT-DN300
Barcode: 192790894737
loading inventory data..

Earn 0 points on this purchase.

Learn more
Key Features & Technical Specifications

Technical Specifications

  • Product Name: Shimano BT-DN300 Di2 Internal Battery
  • Model: BT-DN300
  • Product Type: Internal Di2 battery
  • Battery Chemistry: Lithium-ion
  • Rated Voltage: 7.4V
  • Rated Capacity: 0.5Ah
  • Rated Capacity: 3.7Wh
  • Average Weight: Approximately 52g
  • Wire Standard: Shimano EW-SD300
  • Ports: 3 x SD300 ports
  • Mounting Type: Internal frame, seatpost or compatible battery holder mounting
  • System Compatibility: Shimano 12-speed Di2 road and gravel systems
  • Compatible Chargers / Charging Interface: Charged through compatible Shimano Di2 rear derailleur systems
  • Compatible Rear Derailleurs: Shimano RD-R9250, RD-R8150, RD-R7150, RD-RX825 and compatible SD300 Di2 systems
  • Firmware Updates: Compatible with Shimano E-Tube Project
  • Master Unit: Yes
  • Colour: Black
  • Recommended Use: Road cycling, gravel riding, performance cycling, racing, endurance riding and electronic drivetrain replacement
  • Included: Internal battery only, unless otherwise supplied by retailer
  • Rider Weight Limit: Not applicable

Compatibility Notes

  • Designed for Shimano 12-speed Di2 systems using SD300 wiring.
  • Not compatible with older Shimano SD50 11-speed Di2 systems.
  • Requires Shimano EW-SD300 wires.
  • Unused ports generally require dummy plugs for correct system function and protection.
  • Professional installation is recommended, especially for internally routed frames and seatpost-mounted battery systems.
Notable Tech, Materials & Construction

Shimano 12-Speed Di2 Power Core

The BT-DN300 is the main internal battery for Shimano’s latest semi-wireless Di2 road and gravel drivetrains. It powers the front and rear derailleurs, allowing the shift levers to communicate wirelessly while the derailleurs remain connected to a stable internal power supply.

3-Port SD300 Design

The 3-port layout simplifies wiring by allowing direct connection to the front derailleur, rear derailleur and an optional wired cockpit or additional Di2 component. This is especially useful for riders who prefer maximum reliability or need specific wiring layouts for integrated road bike builds.

Slim Internal Mounting

The compact internal design allows the battery to be hidden inside compatible seatposts, frames or dedicated mounts. This keeps the bike looking clean, modern and uncluttered while protecting the battery from external damage.

Lithium-Ion Reliability

The rechargeable lithium-ion system is designed for long service life, consistent power delivery and low-maintenance electronic shifting. For most riders, Di2 battery life is excellent when the system is correctly installed and maintained.

Shimano E-Tube Firmware Compatibility

The BT-DN300 works with Shimano E-Tube Project for firmware updates, system checks and diagnostic support. This helps mechanics and riders keep Di2 components functioning correctly and ensures compatibility across supported Shimano components.

Clean Semi-Wireless Integration

Modern Shimano Di2 road systems use wireless shift lever communication combined with internally wired derailleurs. This gives riders the clean cockpit appearance of a wireless system while retaining the reliability of a central internal battery.
Size, Fit, Geometry & Measurements

Physical Fit

  • Compact internal battery format
  • Designed for internal mounting inside compatible seatposts, frames or battery holders
  • Shared-style mounting concept with previous Shimano internal Di2 battery systems, although holder compatibility should always be checked

Wiring Fitment

  • Uses Shimano EW-SD300 wires only
  • 3 SD300 ports
  • Suitable for 12-speed Shimano Di2 systems
  • Not suitable for older SD50 wiring without specific system compatibility

Installation Notes

Correct installation depends on:

  • Frame internal routing design
  • Seatpost battery holder compatibility
  • Wire length selection
  • Di2 component layout
  • Dummy plug placement
  • Rear derailleur charging access

A professional bike mechanic should install and test the system to ensure reliable shifting, charging and firmware communication.
Who it is best suited for and where it is best suited

Best Suited For

  • Shimano Dura-Ace R9200 Di2 riders
  • Shimano Ultegra R8100 Di2 riders
  • Shimano 105 Di2 riders
  • Shimano GRX 12-speed Di2 gravel riders
  • Riders replacing a faulty Di2 internal battery
  • Cyclists building a custom electronic shifting road bike
  • Bike shops performing Shimano Di2 service and diagnostics
  • Performance riders wanting clean, reliable electronic shifting
Industry Feedback, Rider Reviews and our own opinion

Professional reviews of Shimano’s latest 12-speed Di2 platforms, including Dura-Ace R9200 and Ultegra R8100, have generally praised the cleaner semi-wireless architecture, fast electronic shifting and improved system integration. Reviews from major cycling media around the 2021 launch of Shimano’s 12-speed Di2 road groupsets highlighted the convenience of wireless shift levers combined with centralised internal battery power for the derailleurs.

Technical Di2 specialists and workshop-focused reviewers have also noted that the BT-DN300 is central to the newer SD300 Di2 ecosystem, with the 3-port design making installation cleaner and more flexible than older junction-heavy systems.

Rider Feedback & Community Sentiment

Rider feedback is generally positive, especially from cyclists using complete Shimano 12-speed Di2 systems.

Common positive comments include:

  • Excellent battery life between charges
  • Clean internal installation
  • Reliable power delivery to derailleurs
  • Reduced cockpit wiring compared with older Di2 systems
  • Simple charging through compatible rear derailleurs
  • Neat integration on modern aero and endurance road bikes
  • Smooth compatibility with Shimano E-Tube diagnostics

Many riders appreciate that the BT-DN300 allows the latest Shimano Di2 systems to feel both modern and dependable, with fewer visible wires and stable shifting performance across long rides.

Why We Love It at Pedal Passion

We love the Shimano BT-DN300 because it is one of the quiet heroes of a modern Di2 bike build. Riders may not see it, but it powers the fast, smooth and reliable shifting Shimano Di2 is known for.
Product Care & Warranty Info

Product Care

  • Charge using the correct Shimano-compatible Di2 charging method.
  • Avoid pressure washing around Di2 ports, connectors and rear derailleur charging points.
  • Keep SD300 connectors clean, dry and correctly seated.
  • Use dummy plugs in unused ports where required.
  • Do not disassemble, modify, heat or puncture the battery.
  • Store the bike in a cool, dry place when not in use.
  • Keep firmware updated using Shimano E-Tube Project.
  • Have the Di2 system checked if shifting becomes inconsistent or the battery drains unusually quickly.
  • Inspect wiring during major services, especially on internally routed frames.

Warranty Information

  • Covered by Shimano manufacturer warranty against defects in materials and workmanship.
  • Warranty generally excludes crash damage, incorrect installation, water ingress from improper cleaning, modification, misuse, normal ageing and damage from incompatible components.
  • Professional installation is recommended for safety, performance and warranty protection.
  • Battery performance can vary depending on system setup, firmware status, riding frequency and storage conditions.
Stock Reference
Product SKU
  • Default Title: BT-DN300
Barcode (GTIN/EAN)
  • Default Title: 192790894737

Shimano

Related Articles

View All Posts