Reasons why a session might finish before the vehicle battery is fully charged
1. Some vehicles have a maximum charge limit, which prevents the battery from charging fully. This setting is available to reduce congestion at motorway charging services; you should consult your vehicle's manual to see how to change or disable it.
2. You may have reached the end of your scheduled session before the battery is full. If you need to continue charging, either switch to plug-and-charge mode or extend the session.