Hey all, I've never really used them much before, but from what I gather parking lights are there in the case you need to park your bike in an area with potentially low visibility to alert people your bike is there. I've parked my bike in someone elses unlit carport until the rain goes away with the parkers on. Now I'm aware that diff bikes, diff battery size. But would anyone know how long you can leave your parkers on for before it kills your battery? I'd assume that they'd be only a small drain on your battery due to their task. But you know what they say about assuming.