It is plenty strong to break loose and remove/reinstall the wheel bolts on any Porsche. One battery charge is sufficient for an entire weekend at the track. Here's a typical scenario for me.
Get to the track and change tires and wheels; put the street tires back on at the end of day one; put the track wheels back on in the morning of day two; put the street wheels back on at the end of day two and drive home. And if it rains, I would often change wheels back and forth during the day, and always had enough juice for the entire weekend without recharging the battery (although I always carried the charger just in case).
You will need a torque wrench to finish snugging up the wheel bolts. And this impact wrench is easily controllable so you don't have to worry about overtightening. You will want a padded impact socket (not sure if the ones that come with it are padded, since when I bought mine, it came with no sockets).
This is the set of impact sockets I have. I have changed my tires/wheels hundreds of times using this impact wrench and sockets and haven't inflicted any damage to the wheels or bolts. Only way to go; in fact on trips I take the impact wrench with me just in case I get a flat--you get spoiled at how quick and easy changing tires becomes that you never want to futz with tire irons, breaker bars, et al.
Padded metric impact sockets
