Dell inspiron 1545 keeps asking for bios password

Hey, I have a Dell Inspiron 1545, it keeps asking for my bios or administrative code i put it in it the message goes away and goes to normal mode were i select users an such an normal yet when i restart it next day goes back to ask for it again my code is easy to remember its my guys nickname lol but still it gets annoying that it keeps asking shows a long digit number than asks for password so anyway to stop it for making me enter it each time ? also dont know if this effects or causes it my battery is bad have to run it through cord light comes on but wont start have to unhook battery an cord than hit power than put it back together and than hit power but once its on it stays on untill i shut it down an restart it next day than have same issue yeah i know need to get another one soon lol but my friends dad said that reason it keeps asking for code at start up is that some watch battery inside the computer has gone bad 0.o think he just messing with me tho lol so any ideas would help and no this isnt a ploy to get around the code thingy my code is easy its undeadomen but just want to get were i dont have to keep entering it every time i restart computer >.>