• 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.