Shimano BT-DN300 Di2 Internal Mount Battery 3-port

Key Features: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 youExcellent sealing and reliability have been proven through repeated field tests in various riding conditions, including extreme temperatures, rain, mud, and cobble stone roadsThe use of a single small and discreet internal battery is light weight, efficient and creates a robust and reliable systemOne charge gives a 1000 kilometre range depending on conditions and front mech operation (as this is the main power drain)500 times rechargeable lifeBattery is to be mounted with seatpost or frame/fork manufactures hardware normally inside the seatpost or seat tube/fork steererReliable and secure water resistant SD300 E-tube terminals connectionCharging is done via stem junction or handlebar displayBattery weight is 50 grams