Gator,
Like yourself, I went from a 8″ Jiffy propane auger to a 8″ Strikemaster 40V. Honestly I only had the opportunity to drill about 100 holes with the 40V. In all honesty, I CAN’T say anything bad about the 40V, its smooth, plenty of power, almost effortless when cutting through the ice. I haven’t had to drill 100 holes in a day yet, because I got the auger at the end of last season. I did drill 30 holes through 24 – 26 inches of ice and the 40V just kept going. I purchased mine with a second battery for several reasons:
1) I was worried about getting a defective battery and finding out when the auger was load tested (on my ice fishing trip).
2) Most folks will take a battery out of the auger after drilling holes and place the battery in a warm location. Frankly I could see my buddy or myself doing something dumb like dropping the battery down a hole or forgetting it out on the lake.
3) If we were to drop the charger or had an electrical short in one of the places we stay at.
I would never want to rely on a single contingency (1 battery) for my ice fishing trips when I’m taking the battery on and off the powerhead in subzero weather, yes something plastic could break! The Jiffy propane auger would get a new bottle of propane and never get messed with, far less of a chance for something to fail. Again nothing bad to say about the 40v auger, just thinking about going lighter.