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Shimano Dura-Ace Di2 SM-BTR1

Dura-Ace Di2 charger that will keep your Di2 system shifting.
The power house of Dura-Ace Di2 is a long-life 7.4V Li-Ion battery that is both compact and reliable, taking shifting effort away from you.
Excellent sealing and reliability have been proven through repeated field tests in various riding conditions, including extreme temperatures, rain, mud, and cobble stone roads.
Using a hard wired battery system which is both light weight and accurate compared to current wireless technology (as a wireless system would require 4 batteries: one for the RD, one for the FD, and one for each shift lever).

• The use of a single small and discreet battery is light weight, efficient and creates a robust and reliable system
• Comes with a bike-friendly mount to allow it to fit most road bike bottle cage bosses
• Optional battery mount adapter is available if standard mount is not compatible
• Reliable and secure water resistant terminals
• Easily removable for charging
• Battery weight is 68 grams