Rahul left his car's headlights on while parking. when the returned back after office hours, he found that his car was not starting. His friend Sarthik, who used to share the car him for coming to office, brought a mechanic who found that as the headlights were left open, the car's battery got exhausted. The mechanic brought another battery and connected its terminals with the battery of hte car. this is how he started the car and told Rahul not to shut off the engine at least 15 minutes.
what hapens if the headlight remains sdson for a few hours while the car is not running?