What happens when the solar garden light is off?

What should I do if the solar garden light controller is off?
When the lamp is off, it is possible that the quality of the controller is not turned off. When the battery is under unsaturated conditions, the voltage of the battery is reduced, the voltage after the step-down control of the power supply (voltage), and the voltage value of the load is cut off. The battery voltage has a recovery process, when it has not been restored to a certain point B (requires charging to reach the discharge return voltage), because the controller does not have a good control of the B-point value when it does not return to this point and connects to the line, When starting the working load, the voltage has put some light, cut off again, and so on...
The above analysis is most likely.