LED light strip connector is called LED light strip special plug.
About 12V.
The output of LED special lamp with plug is about 12V, which does not mean that there is a little electricity. If you measure one separately, there is absolutely no electricity
Plug the charger into the battery separately to see if the light is on. If it is on, it indicates that there is a problem with the input power of your charger, which may be due to poor contact.
Then plug the charger into the power supply separately to see the response of the charger. If the light is on, the charger is broken.
Personally, I think the charger will have poor contact after being used for a long time.