Can You Jump Start an AGM Battery With a Conventional Battery?

AGM Battery Jump Starting Basics

When jump starting an AGM (Absorbent Glass Mat) battery with a conventional battery, it’s crucial to use the correct technique to avoid cross-contamination of the electrolytes. AGM batteries have a unique internal design that’s prone to damage if the electrolytes mix with the conventional battery’s electrolyte. Use a suitable cable with a built-in diode or a 10-amp fuse to prevent backflow and short circuits.

Pre-Jump Starting Preparations

Before attempting to jump start the AGM battery, ensure you have the correct equipment: a 12-volt conventional battery, a suitable cable with a built-in diode or a 10-amp fuse, and a multimeter to check the battery voltage. Make sure both vehicles are parked on level ground and in neutral or park gear. Turn off all accessories and lights in both vehicles to prevent any power surges.

Jump Starting an AGM Battery

Connect the positive (red) cable to the positive terminal of the conventional battery and the other end to the positive terminal of the AGM battery. Connect the negative (black) cable to a metal surface away from the batteries, such as a bolt on the engine block or a metal bracket. Never connect the negative cable directly to the negative terminal of the AGM battery. Start the engine of the vehicle with the conventional battery and let it run for a few minutes. Then, try to start the engine of the vehicle with the AGM battery. If it doesn’t start after several attempts, there may be a more serious issue with the AGM battery that requires professional attention.