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It makes sense if you think about it: more batteries means more power! Running dual batteries can give you more capacity or more volts, depending on how you hook it up. Fortunately, it’s actually really simple to connect 2 batteries together. You just need to do it correctly and safely. To make it easier, we’ve answered some of the most common questions that people have about what it takes to run dual batteries.

Question 2 of 5:

How do you hook up dual batteries?

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  1. Use a battery cable to connect the negative of one battery to the negative of the other battery. Then, use another cable to connect the 2 positives together. This will double your total battery capacity without increasing your amps or volts. [2]
  2. To connect 2 batteries in a series, connect the 2 negatives of each battery to the positive of the other batteries with a battery cable. This will double your volts from 12 to 24. [3]
    • Alternatively, if you want to jump start your car battery, look at the owner's manual.
    • Touch the positive cable on your car and the positive point on the car providing the jump. [4]
    • Then touch the ground on the terminal of your car and the car providing the jump. Find a separate ground that is not on the battery. The top of the strut tower nut is a good spot and works well. [5]
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      Warning

      • Always use caution when handling batteries so you don’t shock yourself.

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