Sorry, but I hate posts like this that casual mention some vague issue is if it's a known, universal, and unfixable problem. There is no "vicious battery drain problem" with iOS 8. If there was, EVERYONE would be complaining about it. Some people get better battery life with 8.1, some people get worse, I imagine most people get about the same. There is no one cause of all these issues. There are about a million different things that can cause excess battery drain, from corrupt settings to cellular connection issues to misbehaving background apps. Most of these things can be tracked down and fixed or worked around.
Rather that trying to hang onto an early beta version forever, you would probably have more luck if you described the problem you're having in detail and what you've done to resolve it. That way people can actually help you.