So I recently bought a set of the 20v max Lithium Ion drill set (impact driver and drill) to use on my whole house remodel. This is after I took 2 of the 18 volt sets back because batteries lasted literally for about 5 minutes total of run time. Needless to say, I am still not impressed with the battery life of the 20v either. I can run about 40 3" screws to a charge on these, maybe a few more. Am I asking too much out of these batteries?