Battery Maintenance And Charging
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If your AGM battery falls below 10.5-volts open-circuit voltage, a standard charger might not recharge the battery. While we recommend a modern charger with an AGM circuit built into it, if you're in a pinch with a standard charger you can simply connect a known good battery in parallel (positive to positive, negative to negative) and then connect the charger to the cables directly as shown. This will allow the charger recognize the voltage of the good battery and start providing a charge. Maintain this charging connection until the open-circuit voltage increases above 10.5-volts, then you can remove the second battery and jumper cables. View Related Article
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