I am sorry, I mixed up battery life between my recorders. R-09HR is about 5.5 hours. That may not be enough for you.
The D50 has digi-in and I am a former Sony DAT customer. It's built like a tank, very solid, and I like the dial control for the gain. Its size is it's downfall, so the R-09HR is an acceptable substitute for my needs as most concerts I record fall in the 1.5-2 hour range.