I would love to try the UflyMike setup, but I'm a little concerned that when the battery dies, you lose all audio, not just the noise cancellation. That would not be fun at a critical time, and is probably the reason it'll never be TSO'd.
Easy to deal with. After the light starts blinking you still have quite a bit of usage..at least a day. You can tell if it is about to die by tapping the ear cup with your finger. If the noise cancellation cuts out for a couple of seconds, it is time to change the battery.