I power the LSD2 with a PS-2, and use line transformers to go line in on my M1. The LSD2 will run about 10-12 hours continuously using a 8x AA 1800 mAh NiMH external pack. I've never tried using a standard 9V batt. I don't think the LSD2 is sensitive enough to run line in w/out transformers.
Quick hijack: If I needed more gain than transformers could provide, could I run mic in on my M1, or would it just brickwall?