Make sure you don't have a bad starter. A few months ago I thought I had a bad battery in my '93 2.3...it was about 2 years old. If I charged the battery it would start a few times then it wouldn't turn over at all. After trying to resolve my battery issues, it turned out to be the starter. The symptoms were exactly like a bad battery.

I replaced the starter with a rebuilt Bosch from Autozone ($110) and it's been fine ever since.

Good Luck,

Dave

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible