I know this is a GRAINGER website,
( So I will have my Flame suit on)
but I frequently dissassemble/assemble
electronic equipment that has many panel screws.
The best one I have found ( Don't laugh)
came from Home Depot is a Ryobi 'green'
battery screw gun..this model is the very small model
with a very low torque adjustment 1/4" bit drive chuck.
it uses a 3v long 'C' cell type battery..
this NOT the tool for heavy duty work such as 10,000 drywall screws a day..
I use it daily rate it A=