The Shimano 12-speed Di2 system has an impressive battery life — usually lasting around 1,500km between charges, depending on how often you shift. When it does need a top-up, charging is quick and easy.
Charging Steps
Use the Shimano Di2 charger supplied with your bike.
Plug one end into a power source.
Connect the other end to the rear derailleur charging port (see image below).
When charging is complete, the light on the derailleur will turn solid green.
Checking Battery Level
For a precise reading of your battery status, connect to the Shimano E-Tube app.
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