I'm here after google searching this issue. I use navigation a lot as I motorbike and the on screen notifications are so valuable as I can't check my smartphone while riding. Since the last update my watch can go from 100% to dead in less than two hours when navigating. Previously I could navigate for 6 hours or more with no significant battery drop. At first, I thought it was the ambient screen activating because of my riding position, so I tried disabling that. No change. Next, I tried cinema mode as any people said. Still massive drains which rules out the screen as the culprit. Blocking notifications also makes no difference as stated. Only airplane mode stops the drain. Which also makes one of the main reasons I got this watch unusable. Seems some kind of android software issue is killing the battery life. I was hoping to find a fix but so far seems to be no way to help