Shimano BTDN300 Internal Mount Di2 Battery (SD 300 Type)

Shimano BTDN300 Internal Mount Di2 Battery (SD 300 Type) Powering the whole Di2 system; the Shimano BTDN300 Internal Mount Di2 Battery (SD 300 Type) has a lightweight; robust and efficient design that’s perfect for integration into high-end road bikes. Its compact size allows it to be discreetly mounted inside a seat post or frame; while it’s comprehensive sealing easily sees off the worst weather conditions. One charge will last approximately 1000 kilometres of use and charging is performed via the Shimano Dura-Ace R9200 or Shimano Ultegra R8100 rear derailleurs or optional junction boxes.