Shimano Di2 BT-DN300 Battery for Internal Mount

Item number: 84425
Di2 BT-DN300 Battery for Internal Mount - universal/universal
Di2 BT-DN300 Battery for Internal Mount - universal/universal
Di2 BT-DN300 Battery for Internal Mount - universal/universal
  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.91 / 5.00

The BT-DN300 Battery by Shimano - The power source for your Di2 shifting system

The BT-DN300 is a lithium-ion battery developed by Shimano for the Dura-Ace and Ultegra Di2 2x12-speed road groupsets. Like its predecessor, it is installed internally in the frame, typically in the seatpost. It has three connections and supplies power to all electronic components via the thin EW-SD300 power cable (not included): the rear derailleur, the front derailleur and, in a fully wired set-up, the two shift/brake levers. Unlike previous models, BT-DN300 does not have its own charging socket, but is charged via the rear derailleur. It is also not Bluetooth-enabled. The nominal voltage of the battery is 7.4 volts, the nominal capacity 500 mAh. A full charge takes up to 1.5 hours if the charging cable is connected to a power supply unit with a USB port, or up to 3 hours if it is connected to the USB port on a computer. Once charged, you can ride your shifters for approx. 1000 km. Blind plugs and small parts required for installation are included.

Information regarding the return of batteries and electrical equipment:

Information on the return and disposal of used batteries and electrical equipment can be found here.


Type: lithium-ion battery
Voltage: 7.4 V
Energy Quantity: 3.7 Wh
Capacity: 500 mAh
Charge Time: 1.5 - 3 h


Shifters & Derailleurs: Dura-Ace Di2 R9250, Ultegra Di2 R8150
Power cable: EW-SD300-I (3 x connection)
Charger: RD-R9250, RD-R8150 (rear derailleurs)
Charging Cable: EW-EC300


- internal installation in the seatpost
- waterproof design
- firmware updates via E-Tube Project
- charging time 1.5 h via USB line power adapter, 3 h via computer USB
- running time approx. 1000 km
- operating temperature -10 °C to 50 °C
- charging temperature 0 °C to 45 °C

Manufacturer Number:



- 1 x Shimano Di2 BT-DN300 battery
- 3 x blind plugs (mounted)
- 1 x battery spacer sleeve (mounted)
- 1 x battery adapter, 2-piece
- 1 x snap ring
- 1 x wave spring washer
- 2 x washer


  • universal/universal: 52 g


  • universal/universal, in stock

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