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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

Fuji Bicycles


Geometry Chart


Altamira LTD

Seat Tube


Effective Top Tube








Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop


Chainstay Length



44 44.0cm 51.5cm


36.3cm 72.1cm


72.0 deg 75.0 deg 6.9cm 40.5cm 97.1cm
47 47.0cm 53.0cm


37.0cm 74.1cm 13.0cm 72.5 deg 74.5 deg 6.9cm 40.5cm 97.7cm
50 50.0cm 54.5cm 54.0cm 37.0cm 76.0cm 14.0cm 73.0 deg 73.5 deg 6.9cm 40.5cm 97.6cm
53 53.0cm 56.0cm 56.0cm 37.9cm 78.3cm 16.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 98.6cm
55 55.0cm 57.5cm 58.0cm 38.9cm 80.1cm 18.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 100.1cm
58 58.0cm 59.0cm 60.1cm 39.7cm 82.1cm 20.0cm 74.0 deg 73.5 deg 6.9cm 40.5cm


Reviews & Community


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Here's what others have to say...

Avg. ride time: 7h 34m 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!


better keep an extra

  • Familiarity:I've put it through the wringer

my fault i got caught out - these systems need a continuous led readout