Duane Ready sells 6v lithium battery 28L, they charged me $2,70, I think they made a mistake. First of all, the battery was dying when I pressed the battery check button, so that's a good sign. It was up at to the range of f/11. It should be right at f/5.6 or at f/2.8 when battery brand new. Next step is to test a whole new role and see if problem is there. Thanks again and hopefully this will help some others with the same problem.