These Duracell CR2025 Lithium Batteries are ideal for Front and rear LED lights, car key fobs and security systems, watches, clocks, PDAs, glucometers, cameras, digital thermometers, calculators and computer equipment, and much more.
The power house of Di2 is the long-life 7.4V Li-Ion Shimano 7970 Dura-Ace / 6770 Ultegra Di2 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.
The Shimano 7970 Dura-Ace / 6770 Ultegra Di2 Battery Charger will keep your Di2 system shifting. Di2 uses a powerful long-life 7.4V Li-Ion battery: keep it in top condition and ready for shifting with this specific Shimano Di2 charger. 1.5 hour charge time. Requires a power lead specific to your country, sold seperately.