[Jeph]

Porsche can make a decent key that works. Mine. Same batteries for me since 2003. (I don't know if they were the originals or not.)

Were the batteries that lasted only 2 weeks from the same batch/package? Where did you get those batteries? Maybe they were bad.

Buy a new, reputable brand of battery (Duracell, Energizer) from someplace like Best Buy (or any other place that wouldn't seem to let a stock of batteries pile up for a long time) to see if you get the same results.

If that doesn't work, I wonder if you're somehow pressing the button while it's in your pocket or something.