Dura-Ace Di 2 (Dual Integrated Intelligence) moves to the next generation. Tested in competition & taken to victory by pro riders in all conditions including the 2012 Tour de France Team Sky. The lithium-ion battery is now available in two versions this version being mounted inside your frame. It can be charged without removing it from your frame & weighs less than half as much as the external battery. Key
Features: The power house of Dura-Ace Di 2 is a long-life 7.4V Li-Ion battery that is both compact & reliable taking shifting effort away from you. Mount the battery inside your seat post to maintain your bike's clean aesthetic. Fully sealed against any water that might work its way inside your frame. One charge can give between 1000 & 2000 (around 1200 miles) kilometre range depending on conditions & front derailleur operation (as this is the main power drain). Can be charged in situ through stem-mounted junction box.
Includes:: multiple slotted leaf spring mounts to fit snugly inside any diameter seat post. Weight: 56g (manufacturer claimed). Compatible with the Flight Deck computer measuring important data such as heart rate altitude cadence gear position battery indicator & allowing you to customise the shifting action of the derailleurs.