1. Please make sure the battery correctly installed, and the charger is in good condition.
2. Please make sure the pin correctly connected.
3. Check and clean up the connections on main body and wall mount.
4. Please have cross function check for two batteries and the charging station to find the failure cause .
Contact Tineco Support Team.
A complete description of your problem or questions (with related photo or video) will enable us to support you more efficiently and effectively.