How to Wire 2 12 Volt Batteries in Parallel

Written by dale yalanovsky
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There are essentially two different and distinct ways to wire 12 volt batteries. One of the ways is called wiring in sequence, and the other way is called wiring in parallel. When batteries are wired in parallel it raises the overall amperage, which basically means that it will increase the running time of the electrical appliance, but it keeps the voltage exactly the same. Although there are other uses for 12 volt applications, the most common form of 12 volt battery usage is in starting and maintaining the electrical systems of internal combustion engines.

Skill level:
Moderately Easy

Things you need

  • 2-12 volt batteries
  • Wire--For automotive style batteries, a minimum of 6 gauge wire is recommended, with a lower 4 and 2 gauge wire preferred
  • Battery or hose clamps
  • Wire stripper
  • Flat blade screwdriver

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  1. 1

    Set your batteries together on a table or floor, putting them together in a back to front layout, just like they would be on a shelf in a store display.

  2. 2

    Strip the wires from each end of your cables, about 1/2 an inch, with a wire stripper. If you are using pre-made cables, go to the next step.

  3. 3

    Attach a cable between the positive leads by securing the bare wire to the post using a preferred battery clamp, but a hose clamp will work. Tighten down the holding screw with a flat blade driver.

  4. 4

    Clamp another cable between the negative posts in the exact same way that the positive side cable was attached. The battery is now wired in parallel and can be hooked up to a 12 volt electrical appliance. The voltage will remain the same, but the running time will be approximately doubled if you have used the same amp hour batteries.

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