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Shimano Dura-Ace Di2 SM-BTR1 Battery
Shimano Dura-Ace Di2 SM-BTR1 Battery

Di2 SM-BTR1 Universal Battery

Mfg PartNum:ISMBTR1A
  (2 customer reviews)
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The life-force of Shimano's advanced Dura-Ace Di2 and Ultegra Di2 components systems.

The SM-BTR1 is a rechargeable 7.4 volt lithium-ion battery which powers the digital shifting components. Shimano recommends recharging every 1,000 miles, but it's safe to charge at any interval. The battery charges in 1.5 hours, and if it does die while riding, the system will stay in the gear the last used gear, so you won't end up on foot.

The SM-BTR1 weighs 70 grams. Its required charger, wiring kit, and frame mounts are sold separately.

Additional Details:

  • Lasts 300 charge cycles without diminishing, then slowly diminishes thereafter
  • Charge time: 1.5 hours
  • Battery weight: 70g.

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.


Weight: 70 grams


Mfg PartNum: ISMBTR1A 

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Not reliable
by Anonymous
0 of 1 customers found this review helpful.

I had to get an extra battery because the first one drains if you forget to disconnect it after each use. There is also very little info on how these work or the readings when connected. After charging it up I get a green and red light. There is no literature on this stuff but no other option anyway other ham you got to have it to get the bike to work.

Reviewed 11/11/2018
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oops, it wasnt the battery
by gpep
Cycling Enthusiast
park city utah

my original batter didn't seem to be working, so I ordered a new one. It was well priced and arrived quickly but I didn't need a new one. I brought bike in for service and they corrected the short in the shift toggle.

Reviewed 11/8/2018
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