If you need new battery for your Di2 system after many kilometers of cyclingfun, this Shimano Di2 battery can replace the old one without any problems. This battery can replace your faulty battery or serve as a backup battery. The battery lasts about 1600 km before it needs to be recharged again. With its 71 grams and 7.4V Li-Ion battery the perfect original replacement battery. Click the battery pack into the mount and you're ready to go.