Using a old car battery tests NHTCzyx 12V/24V 8A Intelligent Automatic Pulse Repair Car Battery Charger.

Since the battery isn't fully discharged, the 8A charger only takes about 40 minutes to charge the battery, then turns into trickle / float charging. The charger constantly maintains 13.8v voltage, so it can be used as a battery maintainer.

The test shows the charger's voltage output is very accurate. The current output which the charger shows is slightly different from my clamp amp meter. Since clamp amp meters usually aren't very accurate, the slight amperage difference displayed by the charger and amp meter is not considered problematic.

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