So, a follow-up and a happy ending. Honda did offer me a trade in for a newer ATV, and gave me the amount I paid for the 2018 Recon towards the new machine. When the dealer dropped off my Rancher, he indicated that other cases of this were being reported and that there was a known problem with some of the ATVs. It may be with the ES system, or maybe just the 2018 version, but its a real issue and I encourage anyone with this problem to push hard for a replacement. For some reason, with the lights on, the battery is drained, even when running at 20-30 mph most of the time.