Hi I am facing unique problem. I have a Dell Latitude D505 which used to work fine till last week. Since then it give wierd problem 1. it does not boot when Main batterry is inserted. 2. If the battery is taken out, then it can boot on the Secondary battery or AC supply 3. after starting the machine, if I insert battery the system hangs. 4. Secondary battery does not get recharged when inserted in the laptop. How can I fix the problem?