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  2. sku: 15413960706029761
  3. SHIMANO 21654

SHIMANO 21654 Dura Ace Ultegra Road Mtn Bike Internal Battery SM-BTR2 DI2/DURA

Sm-btr2 Shimano 21654 Smbtr2 Di2/dura Ace Ultegra Road Cx Mtn Bike Internal Battery

( Brand: Shimano ), ( Manufacturer Part Number: 21654 ), ( Part Type: Internal Bike Battery ), ( Item Width: 7.000 ), ( Item Length: 10.000 ), ( Manufacturer Warranty: No ), ( Item Height: 5.000 ), ( Item Weight: 1.0000 )

Review SHIMANO Smbtr2 Di2/dura Ace Ultegra Road Cx Mtn Bike Internal Battery

Shimano SM-BTR2 Internal Battery for Di2/Dura-Ace and Ultegra Road and Mountain Bikes

Experience the epitome of cycling innovation with the Shimano SM-BTR2 Internal Battery. This remarkable component is an essential addition to your Di2-equipped road or mountain bike, seamlessly integrating with Dura-Ace and Ultegra groupsets to elevate your riding experience to unprecedented levels.

The Shimano SM-BTR2 is a high-capacity, rechargeable lithium-ion battery, designed to provide consistent, reliable, and efficient power to your electronic drivetrain system. With a capacity of 8Wh (6000mAh), it ensures prolonged ride duration without the need for frequent charging, allowing you to focus on your journey rather than battery life.

The SM-BTR2 boasts a sleek and compact design, perfectly camouflaging itself within the bike's frame, thanks to its ingeniously hidden wire routing. This aesthetic appeal is not just for show the streamlined design significantly reduces drag, improving aerodynamics and enhancing overall performance.

Equipped with a USB-C port, charging the SM-BTR2 is a breeze, ensuring you're always ready to ride. The battery also features Shimano's advanced battery management system, which monitors and maintains the battery's health, ensuring optimal performance throughout its lifespan.

The Shimano SM-BTR2 Internal Battery is more than just a power source it's the heart of your electronic shifting system. It delivers precise, smooth, and lightning-fast gear changes, transforming your cycling experience into one that is smooth, efficient, and effortless.

Upgrade your ride with the Shimano SM-BTR2 Internal Battery, and experience the future of cycling technology today.

Pros, Cons, and Conclusion of Buying Shimano SM-BTR2 Di2/Ultegra/Dura-Ace Internal Battery for Road and Mountain Bikes

Pros:

1. Advanced Technology: The Shimano SM-BTR2 Di2 internal battery represents the pinnacle of electronic shifting technology, offering smooth, precise, and efficient gear changes. It is compatible with Shimano Di2, Ultegra, and Dura-Ace road and mountain bike drivetrains.

2. Long Battery Life: Shimano claims that the SM-BTR2 battery offers up to 1400 kilometers (870 miles) of riding per charge, ensuring that you can go long distances without needing to recharge.

3. Stealth Integration: The internal battery design offers a clean and streamlined look, as it is hidden within the bike frame. This not only improves aesthetics but also protects the battery from potential damage.

4. Customizable Shifting: With the Shimano E-Tube Project, you can personalize the shifting performance to suit your riding style and preferences, giving you the perfect riding experience.

Cons:

1. High Cost: The Shimano SM-BTR2 internal battery is significantly more expensive than traditional mechanical shifting systems or other electronic shifting battery options. This might be a deterrent for budget-conscious cyclists.

2. Compatibility: While the battery is compatible with Shimano Di2, Ultegra, and Dura-Ace drivetrains, it may not be compatible with other brands or older Shimano models. Make sure your bike and drivetrain are compatible before making a purchase.

3. Complex Installation: Installing the internal battery requires a certain level of technical expertise, as it involves drilling into your bike frame. If you're not comfortable with this, you may need to hire a professional or follow detailed installation instructions.

4. Potential Damage: Since the battery is hidden within the bike frame, it is prone to damage during crashes or falls. This could potentially lead to expensive repairs or replacement of the battery.

Conclusion:

The Shimano SM-BTR2 Di2 internal battery offers advanced technology, long battery life, and customizable shifting, making it an attractive option for serious cyclists looking for a premium electronic shifting system. However, its high cost, potential compatibility issues, complex installation, and vulnerability to damage should be carefully considered before making a purchase.

Recommendation:

If you are a dedicated cyclist with the budget and technical skills to install and maintain the Shimano SM-BTR2 internal battery, it could provide you with an exceptional riding experience. However, if budget is a concern or you are not comfortable with the potential risks and complexities, consider other electronic shifting battery options or mechanical shifting systems that may better suit your needs and skill level. Always ensure compatibility with your current bike and drivetrain before making a purchase.

Details:

Item Brand: Shimano. This item was pulled from a working environment. Please look at all photos before purchasing. Tested and Working.

Item MPN: 21654. Only items included in pictures are the sale.

part #: 21654 prices

  • $54.99-$98.96

specifications ribicycl:

  • brand: Shimano
  • mpn: 21654
  • part type: Internal Bike Battery
  • item width: 7.000
  • item length: 10.000
  • manufacturer warranty: No
  • item height: 5.000
  • item weight: 1.0000

returns ribicycl:

  • method: Money back
  • time: 30 Days
  • policy: Returns Accepted
  • paid by: Buyer

payments ribicycl:

  • other
  • credit card: Mastercard
  • wallet: Google-pay

seller ribicycl:

  • # reviews: 283219
  • city: Cass City, Michigan
  • rating: 99.6%

shipping ribicycl:

  • type: Fixed
  • carrier: FedEx
  • transit: 3-6 Days
  • class: Standard
  • service: FedEx Ground / FedEx Home Delivery
  • cost: $0.00

general ribicycl:

  • condition: Used
  • Cycling > Bicycle Components Parts > Electric Bicycle Components

offer ribicycl:

  • availability: In Stock
  • started: November 11, 2025
  • quantity: 1
  • sold: 0
  • options: Ship-to-home
part type: internal bike battery, item width: 7.000, item length: 10.000, manufacturer warranty: no, item height: 5.000, item weight: 1.0000,
category: sporting goods > cycling > bicycle components parts > electric bicycle components, sku: 15413960706029761,
Shimano 21654 Is Similar To:
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5 offers $54.99–$98.96 USD
  • Used. Offer #1 priced at $76.95 + $5.00 shipping estimate = $81.95* total. All small parts are lovingly wrapped in cushion foam in boxes that are just the right size. Compatibility: These parts are not compatible with the Dura-Ace 7970 10-speed series or the new 12-speed Di2 series.+$5.00 shipping
  • New. Offer #2 priced at $98.96 + $0.00 shipping estimate = $98.96* total. Use Di2 system checker to update component firmware from e-tubeproject. Shimano Di2 Bike Battery, BT-DN110-A-8, Built-In Type, W/Recycle Mark.FREE SHIPPING
  • Used. Offer #3 priced at $54.99 + $5.62 shipping estimate = $60.61* total. The battery pack holds a charge as it should and is an overall excellent condition. I no longer have used for this one.+$5.62 shipping
  • Used. Offer #4 priced at $72.50 + $7.37 shipping estimate = $79.87* total. Battery only. Shimano Di2 Battery for 9070, 7970, 6870, 6770 Di2 Drivetrains Battery only.+$7.37 shipping
  • New. Offer #5 priced at $109.91 + $0.00 shipping estimate = $109.91* total. Shimano BT-DN110-A Battery Built-In Di2 for SM-EW910, EW-RS910, SC-MT800SC-M9050. Shimano EW-EC300 Charging Cable - For Dura-Ace/Ultegra 12-Speed Di2 Systems.FREE SHIPPING

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