So my controller still has about a quarter of the battery and only charges for 5 seconds and then it stops charging? What could be the reason
Sounds like a defective battery in the stick. Do you still have a guarantee?
No, unfortunately
Then either the battery or the charger is broken. Put it in the trash and replace it, otherwise you risk destroying your switch
Take them to a Repair Cafe as soon as they take place again… That would be the alternative to disposal.
I just tried the other controller loads
Then it's the controller's battery