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Shimano dura ace ultegra di2 btr1 battery the power house of shimano di2 is a long life 7.4v li ion battery that is both compact and reliable, taking shifting effort away from you'. '.strtoupper('e')xcellent sealing and reliability have been proven through repeated field tests in various riding conditions, including extreme temperatures, rain, mud, and cobble stone roads features 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 one charge can give between 1000 and 2000 kilometre range depending on conditions and front mech operation as this is the main power drain 500 times rechargeable life optional battery mount adapter is available if standard mount is not compatible reliable and secure water resistant terminals easily removable for charging weight 68 gramsa 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.