Di2 Battery
Shimano Di2 BT-DN300 Internal Battery
The slim internal battery that powers every 12-speed Shimano Di2 groupset, from Dura-Ace R9200 to GRX RX825. It hides inside the seatpost or frame and charges through the rear derailleur.
Highlights
Why we rate it
Fits every 12-speed Di2 group
Works with Dura-Ace R9200, Ultegra R8100, 105 Di2 R7100 and GRX RX825 Di2, so one spare covers the whole range of semi-wireless bikes.
Three SD300 ports
Direct connections for the front and rear derailleurs, with a third port free for a wired shifter set-up or diagnostics.
Hidden away
At 17mm across it slips inside a seatpost or frame tube and uses the same fixing method as the older BT-DN110.
Long range per charge
Typical riding gives roughly 1000km between charges, depending on how much you shift and the temperature.
No removal for charging
Top it up with the EW-EC300 USB cable plugged into the rear derailleur port, so the battery stays put.
Tech specs
Specification
Manufacturer specification. Details may change without notice.
Specification
- Model code
- BT-DN300
- Type
- Built-in (internal) Di2 battery
- Chemistry
- Lithium-ion
- Nominal voltage
- 7.4V
- Nominal capacity
- 500mAh (3.7Wh)
- E-Tube ports
- 3 (EW-SD300)
- Diameter
- 17mm
- Length
- 152mm
- Weight
- Approx. 52g
- Charging
- EW-EC300 cable via rear derailleur port
- Compatibility
- Dura-Ace R9200, Ultegra R8100, 105 Di2 R7100, GRX RX825 Di2 (12-speed Di2)
- Operating temperature
- -10 to 50C discharging; 0 to 45C charging
In the box
- Includes
- BT-DN300 battery
Ordering
Available from The Cycle Collective
Available to order through The Cycle Collective in Dorking. For availability, setup or advice, call 0203 148 6764 or email hello@thecyclecollective.cc.