I think it's fun to laugh at the well equipped people who aren't as fast as they want to be, but not so cool to convey my disdain outwardly.

Sorry, I was talking about car headlights. I'm not sure about bike headlights in the day, though in heavy traffic, they do seem like a good idea. I prefer neither rechargeable nor disposable batteries. I usually power my headlight with a dynamo hub. Believe me, if you get one of these setups, you will wonder why you waited so long. (But I do have a racing bike that I won't make heavy, and I run a USB-rechargeable headlight on it.) My lights come on whenever the bike rolls, and they stay lit for a few minutes afterwards. I don't think about charging.