Chosen Solution
My original Apple Watch s1 battery was expanding and pushed the screen off the body of the Watch. So I replaced it with a battery from ifixit. The watch now shows the red snake when not charging, and green snake while charging. No matter how long it charges. If I let the watch off the charger for a week or 2, and then charge it, it’ll boot up and work normally for a day. Until it’s time to charge again. The battery continues to drop even while charging on the original apple charger, and then die, and go back to the snakes. Any suggestions?
Sounds to be a faulty battery,Contact ifixit for a replacement replacement battery