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

Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200

$240.00 NZD
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Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200 - Pedal Passion
  • Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200 - Pedal Passion
  • Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200 - Pedal Passion
Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200

Shimano BT-DN300 Di2 Internal Battery for R8100 and R9200

$240.00 NZD

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

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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
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.
Industry & Rider Feedback. A few Comparison Options

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.

Shimano BT-DN110 Internal Battery

  • Used on older Shimano 11-speed Di2 systems
  • Uses the older SD50 wiring standard
  • Not a direct replacement for BT-DN300 in Shimano 12-speed SD300 systems
  • Suitable only for compatible previous-generation Di2 builds

Shimano BT-DN300 Internal Battery

  • Current SD300 internal battery for modern 12-speed Di2 systems
  • 3 SD300 ports
  • Supports R9200, R8100, R7150 and compatible GRX Di2 systems
  • Best choice for Shimano 12-speed semi-wireless Di2 road and gravel bikes

SRAM AXS Batteries

  • External removable battery design
  • Used on SRAM wireless derailleurs
  • Not compatible with Shimano Di2
  • Convenient for riders already using SRAM AXS systems

Campagnolo Wireless Battery Systems

  • Designed for Campagnolo electronic drivetrains
  • Not compatible with Shimano systems
  • Premium but less common in Australian workshops

Where the Shimano BT-DN300 Stands Out

  • Genuine Shimano part for latest 12-speed Di2 groupsets
  • Clean internal installation
  • 3-port SD300 wiring flexibility
  • Strong Shimano workshop support in Australia
  • Reliable lithium-ion performance
  • Essential for modern Dura-Ace, Ultegra, 105 and GRX Di2 systems
Featured Reviews from Pedal Passion Community
  • 5 stars: 3 (75%)
  • 4 stars: 0 (0%)
  • 3 stars: 1 (25%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
B
Bike R.
Probably good, but didn't get to install it

The diagnosis of a faulty battery was apparently in error. The actual problem was that the initial assembly by the local bike store didn't get the cable snapped into the rear derailleur properly. The indication was that the battery was not holding a charge. Actually, the connection was intermittent. when it failed, NOTHING WORKED! (same indication a dead battery would have given). Discovered the real problem after ordering but before the new battery arrived. Thankfully, Amazon's seller refunded the unopened package in full.

J
James V.
For 12 speed only

Nothing wrong with the battery, other than I realized that this works only with the new 12 speed groups. The wires for 12 speed are different, thus the ports to plug the wires into the battery are different. I returned this one and bought the correct battery.

J
Jiddiba J.
Powering di2 well.

This battery works great for my di2 so far.

G
Geovanny B.
Battery for Di2 12 speed only

This battery is for Di2 12 speed only not to confuse it with Di2 11 speed one.

Shimano

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