Shimano BT-DN300 Di2 Battery (2nd Gen.) - Built-In Type Thanks to its compact dimensions, the flat Shimano BT-DN300 battery can be integrated inconspicuously into the seatpost or frame. Not only in terms of dimensions, it is similar to its predecessor BT-DN110, but also concerning waterproofness, it is in no way inferior. The lithium-ion battery features three SD300 ports for the connection to front and rear derailleur. The third connector is used in the case of a fully cabled Di2 groupset. In-house tests with the components of the current Dura Ace R9200/R9250 and Ultegra R8100/R8150 12-speed series have shown that the battery provides a powerful and stable power supply for the powerful actuators of the rear and front derailleur over a range of 1000 km on average. Technical details of the Shimano BT-DN300 Di2 battery pack battery type: Li Ion rated capacity: 3.7 Wh / 0.5 Ah rated voltage: 7.4 V ports: 3x EW-SD300 Scope of supply: battery (without EW-SD300 cable) Product Name: Shimano BT-DN300 Di2 Battery (2nd Gen.) - Built-In Type Manufacturer: Shimano Parts Item Code: SHI509414 activity: Cycling battery ernergy: 3.7Wh voltage: 7.4V Battery Type: Custom Li-Ion/LiPo Pack power supply version: Rechargeable Batteries Model year: 2023 weight: 52g manufacturer item code: IBTDN3001