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But Mad North-Northwest
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The Optima red top has a reserve capacity of 100 minutes, which means it's supposed to have a useful charge after 100 minutes of a 25 A load. Your two bulbs (60 W each) pulled about 10A total. So yeah, that does seem sort of short.

Might not have been fully charged, might be on it's last legs. Or you tried to start it with the lights on, and the draw dropped the voltage below kick-over.
 
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