External Battery

The Shimano SM-BTR1 is an older generation model external battery. Most bikes these days will be equipped with internal batteries such as the BT-DN110.

It weighs about 50g, has a rated capacity of 500 mAh / 3.7 WH and a rated voltage of 7.4 V. You charge the battery by taking it out of the bike and putting it in the SM-BCR1 external battery charger.

When storing the battery away for a long period, remove it when the indicator is at the half-way level (for the FLIGHT DECK) or when the green indicator is flashing (for the SM-EW79A) in order to prolong its useful life. It is recommended that you check the condition of the battery about once every half a year.


Note that this older battery is can be made synchro-shift compatible. You will need to use it in combination with the current generation BM-DN100 battery mount.

SM-BTR1 external battery

Details & specifications

Shimano model codeSM-BTR1
Shimano model nameExternal Battery
Weight70 g
SeriesUltegra 6770, Ultegra 6780, DURA-ACE 9070
Downloads SM-BTR1 Manual
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Shopping links

Are you looking to upgrade your bike using this component? We've added shoppings links to this component's Amazon and eBay pages. Click the images below to view the Amazon product page or eBay search results.

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