Chosen Solution

Hello, I have a fariylight string which was working with a solar panel, however it stopped working suddenly, I don’t know why, I opened it, and there is a battery that gets charged and then is used to supply the lights, now what I want to do is, remove the solar panel and directly connect the lights to the battery, I tried that, now I have two wires from the light, I connect either of them to the battery but it won’t work, I used a tiny resistor from another device but it won’t work too. I watched a video where I can connect the two wires to a usb but it didn’t work too. I don’t know if there’s something wrong in the way I do it. I don’t know if there is a positive wire and negative one but I’ve tried both and it won’t work. what should I do? and know that I’ve got no experience at all in electronics but I’m trying to.

Clean or bypass the on/off switch if there is one. Clean the battery terminals. More detail is on youtube now. You can test it with a regular battery. Just don’t get light on the solar panel.