Battery for me on the beta was horrible day one then actually really really good the last few days. But today once I noticed the Watch and messaging app freezing a lot, the battery took a hit. Lost 50% with minimal use over the course of 3 hours. That also included 3 reboots which cost me 3-4% each reboot. But now it seems to have stabilized and the messaging app seems to have fixed itself. For awhile, the Watch refused to connect to Siri and when I rebooted the Watch, it couldn't recognize that it wasn't connected to the phone anymore. So it was definitely stuck.