I have a Dell Inspiron 3542 laptop. I upgraded to Windows 10 on may 2016. After that, whenever I shut down my laptop, the battery starts draining. But while working, the battery standby is more than 2 and a half hours. I called Dell and they did diagnostic tests and told me that the battery life is good. I contacted Microsoft and they did troubleshooting through remote access. After that, the battery draining happens not all the time,but sometimes. I noticed one thing..I always make sure that I close all apps and programs before shutting down. Sometimes, while shutting down, a screen appears in which "This app prevents shut down" is displayed and before I could click "shutdown anyway" or cancel button, the screen goes off and the laptop shuts down. If this happens the battery starts draining after shutdown. Please help me out.