Sony ECM-MS907
Yes, this takes batteries so it is powered. It can't handle loud loud volumes though. I've never used one but I just looked at it's specs for you...
IC recorder? More specific? For your purposed you'll want something that records at at least 16bit 44.1khz. I think some IC recorders record below those rates and the quality would be noticable. Again I don't use IC recorders so maybe someone who does can answer too...