Free 2-Day Shipping on Orders Over $50* — Limited Time Only Save 25% or More on Pearl Izumi »

Shimano SM-BTR2 Di2 Battery

Sale $99.98 $141.99 30% off

Item # SHI0622

Select options
  • Select options
  • One Color, One Size ($99.98)
  • 100% Guaranteed Returns
  • Free 2-Day Shipping
    on orders over $50

Item # SHI0622

Tuck it away.

Neatly residing within the seatpost, seat tube, or down tube of your bike, the Shimano SH-BTR2 Di2 Battery is a slick alternative to the external-mounted SM0BTR1-67 Battery if you're riding with Shimano's next-level Di2 electronic groupset. Not only does the internal placement of this battery clean up the aesthetics of your Di2-equipped bike, but it also offers extra protection from nasty weather and road grime. Moreover, you'll appreciate the 15-gram weight reduction with this battery over the external version, especially if you're running it on your race bike.

Other than its slick interior placement, the battery remains essentially unchanged, with a fully-sealed, 7.4-volt lithium-ion rechargeable unit delivering the same battery life as the external version. In fact, you'll find the Di2 battery lasts anywhere from 600 to 1,500 miles between charges, averaging somewhere in the 1,000-mile range. Shimano recommends charging the Di2 battery once a week if you're a daily rider. Plus, you'll appreciate the battery's 300-charge cycles before it loses any charge-holding integrity, meaning it'll last approximately six years if you're charging it once a week.

Please note that the Shimano SM-BTR2 Di2 Battery needs complementary parts for charging. You'll need Shimano's new E-Tube Cockpit Junction Boxes (either the SM-EW90-A with three ports, or the SM-EW90-F with five ports), plus the new SM-BCR2 battery charger. Both junction boxes feature an external charging port for connecting Shimano's SM-BCR2 battery charger. And like the previous version, the SM-BTR2 Di2 Battery takes approximately 1.5-hours to fully charge.

This internal Di2 battery comes with seatpost assembly mounting hardware. Pinarello makes a Seatpost Internal Battery Mount (sold separately) for Di2, fitting its Dogma 60.1, Dogma 2, and Dogma 65.1 seatposts.

  • Resides within seatpost, seat tube, or down tube
  • Fully-sealed 7.4-volt lithium-ion rechargeable battery
  • Comes with seatpost assembly mounting hardware
  • E-Tube Cockpit Junction Box, SM-BCR2 battery charger not included
  • 600 to 1,500-mile range
  • 1.5-hour recharge time

Tech Specs

Shimano Di2
Recommended Use:
powering up
Manufacturer Warranty:
2 years
Actual Weight:
One Color, One Size: 58g

Size chart


Di2 Reference Guide


Note: This reference is meant to be used as a guide for creating a Shimano Di2 drivetrain package. For further assistance please feel free to give us a call.


Battery and Wires:

Our Shimano Di2 packages are built for three standard configurations based on battery location and wire routing. First, you'll need to determine if your frame uses an internal or external battery mount, and whether the routing is either internal or external. Below is a guide for which battery, charger, mount, and junction boxes are required for your configuration.

Battery and Wire Configurations
 BatteryBattery ChargerBattery MountJunction AJunction B

External Battery

w/ External Routing

SM-BTR1 SM-BCR1 SM-BMR2 SM-EW90 A/B 3/5 port SM-JC40

External Battery

w/ Internal Routing

SM-BTR1 SM-BCR1 SM-BMR2 SM-EW90 A/B 3/5 port SM-JC41

Internal Battery

w/ Internal Routing

SM-BTR2 SM-BCR2   SM-EW90 A/B 3/5 port SM-JC41

Battery Mounts:

The SM-BMR2 battery mount is available in three configurations -- Long External, Short External, and Long Internal. Both Long versions are to be mounted using the bottle cage mounts, while the Short version is designed for Di2-specific frames with either a chainstay or down tube mounting location.



There are two junctions needed for completing your Di2 build -- A and B.  Junction A, SM-EW90, is located at the handlebars and available in both three- and five-port options. The three-port option is intended for standard shifting with a left and right hand shifter. If you have the intention of using Shimano's satellite sprint shifters, or a combination of time trial shifters and shifter/brake levers, the five-port junction box will be the necessary selection.

Depending on your frame specification, Junction B (SM-JC40 or SM-JC41) is located either internally or externally at the bottom bracket area. Accordingly, SM-JC41 is designed for frames with internal wire routing, while SM-JC40 is intended for external wiring options.


E-Tube Wires:

For your convenience, we've created wire packages for your Di2 build kit in the sizes Small, Medium, and Large. Below, you'll find which wire lengths are included in each kit. Additionally, we've recommended a kit size based on your frame size.

 E-Tube Wire Length Chart
Down Tube Wire 700mm 750mm 950mm
Front Derailleur Wire 300mm 350mm 400mm
Rear Derailleur Wire 500mm 550mm 600mm
Battery Wire 300mm 350mm 400mm


 E-Tube Wire Frame Size Guide
Frame Size  47-52cm 53-56cm   57+cm

Please Note:

E-Tube Wire length suggestions are an approximation. 

Reviews & Community


Write a review

    Add a:
  • Photos
  • Videos

No file chosen

Rather attach a photo from your computer?


Only jpg, jpeg, png, gif or bmp files please.

Submit ReviewCancel
Avg. ride time: 22h 20m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Great Design...with one minor draw back

  • Familiarity: I've put it through the wringer

The internal battery is in many ways superior to the external battery. I have both types on different bikes. While I have never had problems with the external battery getting damaged, the internal battery requires riders to be more vigilant about keeping it charged. That is, I own two external batteries and if for some reason one is low (or in one case dead) before a ride I can simply swap out batteries. This is not as easily done with the internal battery. One can even ride with an additional external battery in your pocket for added safety. So what do you do? Well if you get a Di2 D-Fly and a Garmin you can have the Garmin display the Di2 battery level on your screen as a percentage. This is what I have done for my internal battery mount.

On a more general note, I wish Shimano would stop listing the life of a full charge in distance. It is a pretty pointless metric. When I ride on flats I can go for thousands of miles without a recharge. On hills where I shift much, much more frequently (especially on the energy intensive front rings) I get about 400 miles. Also the batteries degrade with time like any rechargeable battery and so it gets harder and harder to judge the time/miles/shifts you have left before it goes dead. The little indicator lights in the front are very very rough measures. Frankly, Shimano needs to have the junction box display a percentage. Until then I would suggest getting a D-Fly.

It is possible to check the battery level by pressing and holding any shift button for 1.5 seconds (I always do so with the front derailleur, and do a redundant shift onto the same chain ring I am already on). When you do so, the junction box will provide one of 4 lights.

- Solid green = >50%
- Blinking green = 25-50%
- Solid Red = 10-25%
- Blinking Red = <10%

Not quite as easy as having a display with actual battery level, but at least indicates when charging is needed.

Bradley Gehrig
Customer Account Manager
Office: 801–204-4541

Avg. ride time: 11h 18m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Internal Looks Oh so Good!

    Make your road setup sleek as it gets with an internal Di2 setup.

    Electronic's a thing of beauty! If you have any questions on what you need, please give our customer service "Gearhead" team a call!


    Avg. ride time: 5m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Love the internal mount!

    • Familiarity: I've put it through the wringer

    Gone are the days of the gaudy external battery! The stealthy seatpost hidden battery lasts just as long and is a "set it and forget it" item which we all love!

    Unanswered Question

    If I already have a junction box, wires, etc, but am looking to switch from external to internal battery, all I need is this battery and the internal battery charger correct? Assuming my wires are long enough.



    Hi James,

    It depends on what you already have.

    You will need; Shimano SM-BTR2 Di2 Battery, Item # SHI0622.

    Shimano Di2 Internal Battery Charger, Item # SHI0647

    Shimano E-Tube Cockpit Junction Box - SM-EW90 A/B 3 port, Item # SHI0650

    Shimano E-Tube Di2 Wire, Item # SHI0398 long 750-1000 depending on your frame size.

    And some bikes can use Pinarello Seatpost Internal Battery Mount for Di2, Item # PIN0138.

    If you have any questions please give us a call; 888-736-6396