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Item # SHI0549

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Item # SHI0549

The right tool for the job.

This is the one common item between all of Shimano's Di2 groups -- the Di2 SM-BTR1-67 Battery. Call it Ultegra, call it Dura-Ace, but we'll call it the one you'll need. It's a rechargeable lithium-ion battery that mounts on a bracket designed to work with bottle cage mounts. The mount stays on the bike at all times, though the battery can be removed for charging.

Everyone's first question is about battery life. Shimano sat back and watched Mavic on both its attempts at electronic shifting. Both their Zap and Mektronic groups were susceptible to surprise failure. In a nice gesture, Mavic designed the rear derailleur so that the rider could manually move the pulley cages to choose a gear to ride home in. And it happened all too often.

For the prospective Di2 buyer, know this: running out of juice is nearly impossible. Besides the long battery life and short charges, there is a service light integrated into a module that is part of the shift wire near where it exits the tape under the handlebar. Holding one of the shift paddles down for a few seconds will activate the indicator light. When the light is green, it is fully charged. At 50% charge, it will start flashing green. At 25% charge, it will turn solid red. It will flash red when the battery is critically low. One nice aspect to the electronics in the Ultegra Di2 kit is that the battery is in a sleep mode and not using any energy when you're not shifting.

The Di2 battery lasts from between 600 to 1,500 miles between charges. You can expect that lots of shifting in cold, cold weather will result in shorter battery life, but we've found that 1,000 miles is an average interval. There is no "charge memory" in the battery, so you can recharge it as often as you like, though Shimano recommends once a week or so if you're a daily rider. The battery can go 300 charge cycles at 100% integrity; charging once a week means almost six years.

Wondering about getting a second battery, "just in case?" We asked Shimano. They say it's only a good idea if you think you're really going to go over 1,000 miles between opportunities to charge the battery. And, if you somehow miss all the warning signs and run the battery down in the middle of a ride, your bike will stay in the gear it was in when the battery died. You'll have to replace or recharge the battery to move the derailleur once again.

The Shimano Di2 Battery operates on 7.4-volts and is easily recharged with the Di2 charger (not included). Once discharged, it takes 1.5 hours for the battery to receive a complete charge. It uses lithium-ion technology to maximize output and minimize size.

  • 1000 mile average life
  • Battery life indicator
  • Approximately 300 charges
  • 1.5hr charging time
  • Bottle cage mount
  • Compatible with Shimano Ultegra Di2 6770 and 6870, and Shimano Dura-Ace Di2 9070
  • Di2 charger not included

Tech Specs

Shimano Ultegra Di2 6770, Shimano Ultegra Di2 6870, Shimano Dura-Ace Di2 9070
Recommended Use:
charging your 6770, 6870, and 9070 shift system
Manufacturer Warranty:
3 years
Actual Weight:
One Color, One Size: 73g

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


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Avg. ride time: 13h 44m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

durable, works great

  • Familiarity: I've put it through the wringer

I really love these batteries. I charge mine once a month maybe? They just work.

Works as OEM, cost more than my car batt

  • Familiarity: I've put it through the wringer

I lost my initial battery after about 500 miles on a rough road. I bought a replacement and it has worked just as well. I charge it about every 500 miles.

I would give this product a 5* except for the pricing. My car battery costs less. This is shimano charging a price premium for their branding.


  • Familiarity: I've put it through the wringer

My initial battery life was exceptional. However, once it was depleted it fails to hold a charge for more than 75-100 miles. It has become routine for me to spend significant time during my rides stuck in whatever gear I was riding when the battery died. This happens despite showing green on the battery indicator light at the start of the ride.

better than aftermarket

  • Familiarity: I've put it through the wringer

After using aftermarket batteries I have come back to this external mounted unit for its continuous ability to always be reliable. It just plain works!