I’m running the 8″ K Drill with a Milwaukee 18v Fuel cordless drill with the 4 ah batteries. It weighs right at 9.5 #’s. I ended up getting 2 more 4 ah batteries off of Amazon for $83 each. We’ve only got 12-13″ of ice in our neck of the woods, but I can get 25-26 holes per battery. I can easily drill 100+ holes with my set up. I have no doubt that one can get 30+ holes per battery with a 6″ in the same ice conditions.
Next year I’ll get a Tanaka powerhead for the thick ice & will have a 17# gas powered auger. IMHO there is no replacement for gas in 18″+ of ice when you have to continually drill & move to get on fish. I don’t miss my SM Lazer, this K Drill drills just as fast & opens up old holes like butter.
I’ve been running the Milwaukee 18v fuel on a 6.33″ lazer synthetic, was easily getting over 40 holes per 4ah battery on 16″ of ice. The ice is a bit thicker now, but I really don’t see a need to use a different powerhead unless I’m needing a bigger hole.