This article discusses charging all versions of Shimano Di2 batteries for 10, 11, and 12-speed groupsets.
Shimano Di2 R9200 / R8100 (12-speed) battery
The 12-speed Shimano Di2 uses an internal battery (BT-DN300) and requires the EW-EC300 charging cable.
- Connect the USB-A end to a regular smartphone charger with at least 1.0A capacity.
- Pop open the charging port on the rear derailleur by placing your finger on the notch.
- Connect the magnetic end rear derailleur. Make sure the connection is snug and secure.
- The LED on the rear derailleur will light up blue while charging and goes off once charging completes.
Things to note
- The derailleurs will not work during charging.
- This cable can also charge the latest Shimano power meter (FC-R9200-P).
- If the LED flashes red, the charging current is insufficient. Find a charger with at least 1.0A capacity.
- If the rear derailleur becomes too hot while charging, stop charging for a while. If it persists, contact your local bike shop.
Shimano Di2 R9150 / R9000 / R8000 / R6870 (11-speed) battery
The 11-speed Shimano Di2 uses an internal battery (SM-BTR2, BT-DN110) and requires the SM-BCR2 charger.
- Connect the USB-A end USB cable to a regular smartphone charger with at least 1.0A capacity.
- Connect the micro-USB end of the USB cable to the charger (SM-BCR2).
- Pop open the charging port on Junction A. It can be below the stem, handlebar end, or downtube, depending on your setup.
- Connect the other end to Junction A. Make sure the connection is snug and secure.
- The Charge indicator will light up in orange while charging and goes off once charging completes.
Things to note
- The derailleurs will work during charging.
- If the Charge or Error indicator lights up or flashes, there is a problem with the charging. A current of less than 1.0A usually causes this.
Shimano Di2 R7970 / R6770 (10-speed)
The 10-speed Shimano Di2 uses an external battery (SM-BTR1). Use the SM-BCR1 charger.
- Remove the battery from the bike.
- Insert the battery into the charger SM-BCR1.
- The charging indicator will light up in orange while charging and goes off once charging completes.
- Depending on your battery level, it will take around 1.5 hours for a full charge.
- Remove the battery from the charger and reinstall it back onto the bike.
This applies to 10-speed (R7970 / R6770) 11-speed (R9150 / R9000 / R8000 / R6870) and 10-speed Shimano Di2 rear derailleurs.
How long does it take to charge the battery to full?
Depending on your battery level, it will take around 1.5 hours (AC adapter) to 3 hours (computer USB port) for a full charge.
Is the shifting working while the battery is charging?
The shifting will not work for 12-speed derailleur while charging. Shifting will work for 11-speed derailleurs while charging.
Will it continue to charge when the battery is full?
The charging will automatically cut off when the battery is full. The Charge indicator light will go off. If you attempt to charge a full battery, the Charge indicator will not light up, or light up and turn off immediately.
Check your Di2 battery levels regularly to ensure you don’t run out of battery midway through the ride.