you can't...lol....
To open a 2003 Porsche Boxster with a dead battery, first, locate the keyhole on the driver's door. Use the physical key hidden inside the key fob to unlock the door. Once inside, you can access the front trunk (frunk) to jump-start the battery or replace it. If needed, you may also be able to use a portable jump starter connected to the battery terminals.
To jump-start a Porsche Boxster S, first ensure both vehicles are turned off. Connect the positive (red) jumper cable to the positive terminal of the dead battery and then to the positive terminal of the working battery. Next, connect the negative (black) jumper cable to the negative terminal of the working battery and attach the other end to a metal ground point on the Boxster, away from the battery. Start the working vehicle, let it run for a few minutes, then attempt to start the Boxster.
To jump-start a Porsche Cayenne, first ensure the vehicle is in park and turn off all electrical systems. Connect the positive terminal of the dead battery to the positive terminal of the donor vehicle's battery, then connect the negative terminal of the donor battery to a grounded metal surface on the Cayenne. Start the donor vehicle, let it run for a few minutes, then attempt to start the Cayenne. Once it starts, carefully disconnect the cables in reverse order.
Either the battery is defective and has a dead cell or something is on which is pulling power from the battery every night.
Dead battery?
Pull the hood release handle inside the vehicle.
Anyplace that sells batteries can get you the correct size for your Porsche. You do not have to purchase a battery from Porsche.
Battery could be dead , or a poor cable connection to the battery
No, you cannot push start a manual car with a dead battery. Push starting requires the battery to have some charge to ignite the engine.
from a dead battery to working battery
Dead battery ?
Sounds like the battery has a dead cell