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A load test employs an instrument that puts a high drain on the battery to detect problems that hygrometers and resting voltage miss. If the capacity of the battery has significantly decreased or if the connections between the plates or cells have deteriorated, the load test reveals this. LectricLimited's Load Tester also incorporates an analog voltmeter. Note that many auto parts stores will perform a load test, other battery tests, or alternator tests for free.