You're a wild and crazy guy! I grew up in that climate and no steenkin' way would I ride in the rain, after dark, without a light! I rode all over Burlington County, NJ, in all kinds of weather, and the minimum lighting I had was two strap-on leg lights. In my old Boy Scout backpack I carried, among other things, spare batteries.
Occasionally I was caught unprepared but not quite in your circumstances. I'm glad this tale has a happy ending.