This past summer my friends and dogs hopped into my car and we were off for an evening at the drive-in movie theatre. Unlike older theatres where you hang a speaker over the window, this theatre broadcasted ove a local FM channel. Great until I started worrying about the itty bitty battery draining. So I turned the car on. The problem is, the daytime running lights come on. Not the greatest etiquette at a drive in. So we sat in silence and attempted to overhear the other cars. The drive-in is a triple-header, so three movies comes out to 6 hours, that's a long drain on that lil guy. Any thoughts?