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Using a digital voltmeter, simply check across the battery terminals.
You should get 12.66 volts.
Next turn your headlights on for ten seconds and check again.
This dissapates any "surface charge"
It should still be in good shape.
Courtesy Mark v
Battery Charge Table
12.6V or higher: 100% charge
12.4V - 12.6V: 75-100%
12.2V - 12.4V: 50-75%
12.0V - 12.2V: 25-50%
11.7V - 12.0V: 0-25%
11.7V or less: 0% (and probably not capable of being recharged)
If it needs to be charged, charge it up overnight, and check it in the morning, as above.
IF it is dead in the morning you need to rule out if there is something draining the battery or if the battery just doesn't hold a charge anymore, and needs to be replaced. To test the battery, disconnect it, charge it up and let it sit overnight, then recheck the voltage. It should stay at the 12.66 overnight.
See How to check for a parasitic drain if needed.
You should get 12.66 volts.
Next turn your headlights on for ten seconds and check again.
This dissapates any "surface charge"
It should still be in good shape.
Courtesy Mark v
Battery Charge Table
12.6V or higher: 100% charge
12.4V - 12.6V: 75-100%
12.2V - 12.4V: 50-75%
12.0V - 12.2V: 25-50%
11.7V - 12.0V: 0-25%
11.7V or less: 0% (and probably not capable of being recharged)
If it needs to be charged, charge it up overnight, and check it in the morning, as above.
IF it is dead in the morning you need to rule out if there is something draining the battery or if the battery just doesn't hold a charge anymore, and needs to be replaced. To test the battery, disconnect it, charge it up and let it sit overnight, then recheck the voltage. It should stay at the 12.66 overnight.
See How to check for a parasitic drain if needed.