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1984 911 Carrera Battery Life

Electrical and Electronic

Vehicle Information: Model: 911 Carrera; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2 Rebuild; Total Mileage: 142K;

How can I figure out the status of my battery? I ran it dead one night (stereo on). I charged it myself for 24hrs. No problems. Then, recently, noticed some slow starts,(after pwr antennae install). I drove for many miles, still having slow starts. The next AM dead. I charged it for 24hrs and it starts perfectly. Shouldn't my alternator be keeping my battery fully charged? How can I tell if I need a new battery or new alternator? I do not have any lights out or dimming on starts.

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