Also shows +/- amps for easy diagnosis of current leakage problems. Interprets data from the charging/starting system on easy-to-read LED display voltmeter and ammeter. With that said, my general recommendation for replacing worn batteries is to replace both flooded-cell and AGM with their original equipment (OE) equivalent.6042 Associated Battery Electrical System Tester 12/24v 500a Digitalĭesigned with highest quality and versatility in mind.
The upshot of this is that a modern charging system controlled by various inputs to the engine control module (ECM) can more efficiently maintain an AGM battery than can a conventional voltage regulator, which responds only to battery voltage and ambient temperatures. For example, the power-train control modules (PCMs) in some vehicles, like BMWs, are programmed to adjust their charging rates to compensate for normal battery plate wear. Now that we’re in the era of computer-controlled battery charging systems, charging voltage can be influenced by operating conditions as well as accessory load, battery SOC and battery SOH. This feature eliminates wasted shop time by displaying a “defective battery” (or equivalent warning) if the battery doesn’t support a specific charging rate profile. Any modern charger incorporates an AGM charging mode, and the most sophisticated battery chargers also contain a “diagnostic charging mode,” which is based upon the above bulk, saturation and float charging modes. If you’re recharging batteries with an “old-school,” flooded-cell battery charger, you’re likely going to ruin an AGM by overheating the battery’s electrolyte. The “float” or maintenance mode incorporated into most modern chargers will hover between 13.2 volts and 13.4 volts, while the amperage rate will range between zero and 1.5 to 2.0 volts. In contrast, the “saturation” mode is a low-amperage, high-voltage charging rate that occurs as it approaches a full charge. If the battery is in a good state-of-health (SOH), most chargers will maintain a high-amperage, low-voltage “bulk” charging mode until it regains its charge. The charging voltage of any battery is affected by the battery’s state-of-charge (SOC). A typical “float” or maintenance charge should be about 13.8 volts. Similarly, AGM batteries can be charged up to 14.4 volts without evaporating the water from the electrolyte. For this reason, the internal core temperature of an AGM battery shouldn’t exceed 120° F during the recharging process. Once the water boils from the electrolyte through a pressure sensitive venting valve, it can’t be replaced. Unlike a flooded-cell battery, an AGM can be immediately damaged by overheating the electrolyte.
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