[jmatta]

When you purchase your new battery, be sure to also buy a "battery maintainer". This is NOT a trickle charger, but a very low voltage device that keeps your battery at a safely charged level, avoiding almost all problems with low or dead batteries.

There are numerous makes and models; most for less than $50 (you don't need a fancy one with the Porsche name on it). I have two "Battery Tender, Jr" models which I purchased for $24.95 ea and they work terrific.