Best way to test a battery is to charge it then turn on your headlights. A new battery will keep headlights on for 3+ hours before it dumps. A weak battery will not even come close to that, some as low as 20 minutes when they are on their last lags.
9 holes of golf and I was OK, 18 and I was in trouble
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I have seen batteries pass the quick load tests and be dead the next morning.
Charge it, turn on the headlights and wait an hour, test the voltage.
regards
Mech