nequiz

Hi. I have a JL-2 plus charger, when I put a battery to charge, the light changes to red and after a time of charging, the light changes amber flashing, but never reaches green. According to the manual, my battery has a fault. ok, but it does the same with the 18 batteries I have. Can you advise me or tell me if I definitely can't do anything with my own hands? a fuse a mosfet, a component that is not turning green. thanks in advance