trustfire mini 02 problem

my mini-02 is pissing me off, it was working fine until now that it keeps staying on, what would be the problem? i changed a battery and as soon as i press it down to twist the top part on, the light turned on. i don’t know what’s going on?

Have you tried unscrewing a bit the driver board ? If I remember correctly, the driver is isolated from the body/head which is connected to the negative electrode of the battery. A small short somewhere could lead the light to stay always on.

(Sorry for my english, not sure if I was clear)