I've used my 75 twice with conventional duracells. Hasn't shut off once. The batteries even tuck inside the housing much nicer. Oh well. Got about 9 hours on them and still showing full power. I always run as much sens. as I can for the situation, and disc. on 0. I'm definitely getting better with it. Went back to the house I found the boy scouts token, and many other items and pulled out a rosey dime, and a few wheats. I seem to do better slowing the coil sweep down a tad, and overlapping my passes. Only thing I keep noticing is little faint signals. They do register, and some read high number on the vdi. They give a deep reading on depth gauge. Sometimes I wonder if my high sens. is giving a false signal. Still learning the machine but I'm def. getting better with it. Went back over anot her yard I hunted. Swiped over an old plug I had dug, and saw a quarter reading. Opened the plug and found it. Nice having a pinpointer, lol. Oh, and 2f for trashy areas, and 3 tones for things like fields for me. I feel like as long as I'm still wanting to go out and hunt the next day, there must be some progress.