The heart of Shimano Di2 is the durable Shimano BT-DN110 Di2 Internal Mount Battery, designed to deliver long-lasting performance while effortlessly handling shifting tasks. Field tests in various riding conditions, from extreme temperatures to rain, mud, and cobblestone roads, have proven its excellent sealing and reliability.

Using a hard-wired battery system offers advantages in weight and accuracy compared to current wireless technology, which would require four separate batteries: one for the rear derailleur, one for the front derailleur, and one for each shift lever.

For convenient charging when mounted in your seatpost, we recommend purchasing the SM-BCR2 external charger to avoid the hassle of removing your battery and seatpost every time you need to charge it.

Features:

• The use of a single small and discreet internal battery is lightweight, efficient and creates a robust and reliable system
• One charge can give between a 1000 and 2000 kilometre range depending on conditions and the front derailleur operation (as this is the main power drain)
• 500 times rechargeable life
• Battery is to be mounted with seatpost or frame manufacturers hardware, normally inside the seatpost or seat tube
• Reliable and secure water resistant E-tube terminal connection
• Charging is done via SM-EW90 junction A (not included)
• Manufacturer claimed weight: 50 grams (battery only)
• Compatible with all Shimano Di2 electronic gear systems