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Headlights aren't the most complicated tech, even in newer cars with fancy systems like adaptive headlights, but there are a handful of different points of failure that could result in the situation that it describing. The easiest way to keep the battery from dying is to straight up disconnect it. If it never done that before, then it'll just want to make sure that it disconnect the negative cable typically black instead of the positive cable typically red to avoid even the possibility of a short circuit. Once the battery is disconnected, the headlights will turn off, and the battery won't die. The other way to shut the headlights off is to remove the appropriate fuse or relay. This is a little more complicated than disconnecting the battery since you will have to locate the correct fuse panel and then figure out which fuse or relay to pull. It will prevent a loss of power to the computer and radio, though, so you won't have to deal with any fallout later on. Dr. S Senthil Kumar | Sathiyaprakash K | Vijay R | Sudharsan D "Automatic Headlight Control with Central Locking System" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-2 , February 2018, URL: https://www.ijtsrd.com/papers/ijtsrd8217.pdf