I dropped a new Interstate MT 91 Battery in the back seat when this happened and haven't had a no start in a while. (fingers crossed).
The old battery was a MB dealer replacement, that was less than 2 years old. The original owner drove less than 1500 the past year and less than 3K in the last 3 years, which leads me to think it didn't have a good charge, even after a 500 miles return home trip. (I'm a believer in chargers for a good charge rather than relying on the alternator.)
90 944/S2 Cabriolet
94 Toyota Pickem up