Blackberry 9105 Battery + red cross – is this , suggestions hardware issue or a software problem

Hello guys, Blackberry 9105 Battery + red cross , can some one to be helped me, first time i cant repair BB Along with that problem, at previous time i just change battery – and all time it to be helpeded me ! But now i can t, when i try to switch him he show me battery Along with red cross, i try flashin him, but nothing , i try this solution IMG-20121013-00056 – Download – 4shared , but it no to be helped me. Any one have idea about this ?