Causes:
The circuit is not working properly
Insufficient battery power
Corrosion of battery joint or loose cable connection
Cable connection bad or charger or battery fault
Start motor failure
Start circuit control screen fault
The other possible fault

Maintenance method:
Check circuit
Battery charging and battery replacement if necessary
Check the wiring terminal of the cable, tighten the nut, replace the seriously corroded connector and nut
Check the connection between charger and battery
Seeking help
Check the control panel of the start / stop control circuit