I like the drills, no question there, but along side of the durability on it, there should be a battery bar as well. So when the drill needs to be recharged, you would need to get a Fully Charged Battery to put into the drill and get an Empty Battery when switching out the battery. Or if going on a long mining trip, you would need to craft a Battery Backpack for extended battery life.
I like this idea. I would love to have the drill be virtually indestructible and using batteries to fuel it. Each battery would consume a full inventory slot rather than stacking to make it more valuable.
This sounds more like a pain to me than anything to balance it or make it fun. No support on this one.