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
Rated 5 out of 5 by Anonymous Fantastic
My Di2 is on a Trek 6.5 and has worked flawlessly since Sept. First use was on a Century. After more than 600 miles I put the battery on charge ( even though the on board indicator said 1/2 ). The "no-trim feature" is the best part, though the speed and ease of shifting is also a nice feature. One you get past the price the Di2 is a joy to ride with. Feb 2, 2010
02 February 2010