Shimano Di2 Battery (BT-DN300)

The DN300 built-in type battery features the same waterproof design that Di2 users have loved for generations. Now with 3 ports, it delivers stable power to Shimano's 12-speed road derailleurs (and shifters if set up fully wired). 

• Compatible with thinner next generation electric wire SD300 and systems after R9250/R8150 series 
• Li-Ion type 
• Capacity: 500 mAH / 3.7Wh (± 2000km autonomy) 
• Rated voltage: 7.4V 
• Charges using EW-EC300 Di2 Charging Cable (sold separately)
• Fixing small parts included
• Weight: 52 g