Shimano DI2 EW-EC300 group charger cable

The Shimano EW-EC300 Charging Cable is a charging cable specially designed for Shimano Di2 12-speed electronic drivetrains. It makes it easy to recharge the system's internal battery directly via the charging port on the rear derailleur.

Featuring a specific Di2 connector and a USB-A plug, this cable simply plugs into a mains charger, computer or any USB power source. With a length of around 1.5 metres, it's flexible enough to charge your bike on a workshop stand or against a wall.

Key features

Charging cable for Shimano Di2 12-speed drivetrains

Direct connection to rear derailleur for charging

USB-A socket compatible with most chargers

Cable length: approx. 1.5 m

Fast charge of the internal Di2 battery (approx. 1 h 30)

Magnetic / specific connector Shimano easy to clip on

Compatibility

Compatible with Shimano Di2 12-speed groupsets, including :

Dura-Ace R9200 / R9250

Ultegra R8100 / R8150

FC-R9200-P and FC-R8100-P power sensor cranks

Contents

1 × charging cable Shimano EW-EC300

Highlights

Quick and easy Di2 battery charging

Secure, easy-to-use connector

Official accessory Shimano for 12-speed groupsets

Can also be used to charge compatible Shimano power sensors.

✅ Ideal for keeping the battery in your Shimano Di2 electronic transmission always ready to ride.

QUESTIONS/ANSWERS

What is the Shimano EW-EC300 cable used for?
The Shimano EW-EC300 Charging Cable recharges the battery of Shimano Di2 12-speed electronic transmissions. It connects directly to the charging port on the rear derailleur.

Shimano Which groupsets is this cable compatible with?
This cable is compatible with Shimano Di2 12-speed groupsets, including :

• Shimano Dura-Ace R9200

• Shimano Ultegra R8100

How do I charge the Di2 battery with this cable?

1. Connect the USB plug to a mains charger, computer or external battery.

2. Connect the end of the cable to the charging port on the rear derailleur.

3. Charging will start automatically.

How long does it take to charge the battery?
A full charge usually takes around 1? to 2 hours, depending on the power source used.

Can the bike be charged without removing the battery?
Yes. With the Shimano EW-EC300 Charging Cable, the battery can be charged directly on the bike, without having to dismantle it.

Can this cable be used to update the Di2 system?
No. The Shimano EW-EC300 Charging Cable is for charging purposes only. System updates are carried out wirelessly using the Shimano E-Tube Project application.

How long is the cable?
The cable measures around 1.5 metres, making it easy to charge the bike on the ground or on a workshop stand.

Is this an official Shimano accessory?
Yes, the Shimano EW-EC300 Charging Cable is an official accessory designed by Shimano for Di2 12-speed drivetrains.