Shimano
E-Tube External Battery SM-BTR1 for Di2

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Shimano Di2 Batteries. Must purchase battery, charger, and power cable to complete the system.

Di2 External Battery, battery charger, and power cable are universal between Dura-Ace 7970, Dura-Ace 9070, Ultegra 6770 and Alfine Di2 systems
Battery weighs 71g
All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/

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