• This product has multiple versions, and they may not be compatible with each other. Please contact our support team before purchasing to confirm which version you need.

• When consulting the support team, please attach photos of your bike’s display screen, the motor’s external cable connectors, and the label on the controller to help us provide solutions.

Note: The silver switch button indicates the new version.
The current C11/C11PRO model uses this new battery.
If your C11 battery has a black switch button, it's the old version.
Please check carefully to avoid purchasing the wrong version.

Note: The old version has a black switch button.  
The current C11 model uses a new battery with a silver button.  
Please double-check to avoid buying the wrong version.