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Old Wizard
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At Home Load Test

The best way to assess battery health is to take it to an auto supply store and have them do a load test. A load test determines if the battery can deliver its rated current to a resistance similar to that of a starter motor without dropping below an voltage threshold value.

Alternatively, you can simulate this test by first charging the battery (a healthy fully charged battery should measure about 12.6 volts) and then remove the fuse to the fuel pump so that when the engine is cranked it won't start. Measure the voltage across the battery terminals as it cranks. If the voltage drops into the upper-9 volt range, you need a new battery.
 

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