Nothing is a massive issue in beta 1. Even if the OS crashed every 30 seconds beta testers aren't supposed to go around getting their knickers in a twist about it. You would submit a bug report, and advise you are unable to test further and wait for beta 2. You don't demand a beta 2 'immediately.'
If your user experience is being impacted every day then you shouldn't have installed a developers' beta 1 OS on your phone. If this were a release candidate, you might have a point, but there are months ahead where the beta process will take its usual course. You may find the battery drain is actually a very low priority bug right now, depending on how much Apple know about the causes, and how much work would be involved to fix it.