There is problem in the starting of my car. In morning it start normally without any problem. But when during driving I stop the car and try to ignite It again, It will take 2-3 secs extra to strart the car. Delay start u can say. Is it battery problem or something else. Headline brightness is same with or without running the engine. Mechanic said that battery is wear off. But if there is a battery problem then why do it start normally in the morning?