Connecting Batteries in Parallel to Extend Runtime!

Key Points:

  • The battery in parallel connection provides you more runtime while keeping the voltage the same.
  • To connect two batteries in parallel, join the positive terminals together and negative terminals together.
  • Make sure to connect two identical batteries with the same charge.

If you need an extended period as a backup from a battery, you definitely have to connect multiple batteries in parallel. But how to do it?

For connecting two or multiple batteries, you need to connect them in parallel properly. This includes connecting the batteries in the right order. The thumb rule of a parallel connection is connecting the positive terminal with the positive and the negative with the negative terminal. You must connect the first positive terminal to the next positive terminal of the other battery. And, connect the negative terminal of the first battery to the negative terminal of the second one.

This article discusses how to connect batteries in parallel to extend battery runtime.

So, let’s get started!

What to Consider Before Connecting Batteries in Parallel

If you are about to connect two or more batteries in parallel, their capacity or amp/hour will be improved while the voltage remains the same. If the batteries have the same voltage and amp/hour, the combined battery’s capacity will be doubled. For instance, if you combine two 6-volt batteries with 10AH capacity in parallel, the combined one will give you the same 6-volt voltage with a doubled capacity which is 20AH in this case.

However, it is recommended not to connect batteries of different voltages in parallel. But, why is that?

The battery with a higher voltage will try to charge the low-voltage battery to balance the circuit. But the disposable batteries are designed not to be recharged. In that case, the low-voltage battery may be overheated or bloated and at worse exploded.

If the batteries are rechargeable, on the other hand, the battery with a low voltage will charge from the high-voltage battery to balance the circuit. If the batteries create a charge limit within the circuit, it may result in leaking, swelling, or overheating of the battery bank.

Again, overheating can cause a rapid charge drain of the higher-voltage battery. So, you get it that the more the voltage difference between the batteries will be, the higher will be its chance to overheat and even explode.

Again, if you connect two different-aged batteries in parallel, it will give you trouble as well. The older battery should have a lower voltage capacity as it decreases with time. It also takes more time to charge at the same speed as the new one.

That’s why it is important to use same age batteries with the same capacity. Try to charge them fully before connecting in parallel. Otherwise, one will charge the other one providing you no benefit.

How to Connect Batteries in Parallel to Extend Runtime?

Once you collect your suitable batteries, now is time to connect them in parallel. Apart from the rechargeable batteries, you also need pairs of battery cables. Here’re the steps to follow to connect batteries in parallel to extend runtime.

Place the Batteries

Place the batteries closely side by side. The batteries shouldn’t have a long-distance between them as it will require long cables. The longer the cable will be the more its internal resistance will be. 

Connect the Positive Terminals

The red terminal indicates the positive terminal. Take the red battery cable to connect the positive (red) terminal of the first battery to the positive of the other battery.

Connect the Negative Terminals

Take the black negative battery cable and connect the negative (black) terminal of the first battery to the negative of another battery. You must never connect positive terminals to negative terminals as that’ll short-circuit the overall connection.

Check the Connections

Once you are done with the connection, it is time to check whether you have put a connection through the same polarity or not. The first battery’s positive must be connected to the positive of the second one. It is applied for the negative terminals as well.

If the connections are incorrect, they will never serve your purpose. Theoretically, you can connect several batteries in parallel as much as you wish. However, when you start connecting numbers of batteries in parallel, you may get confused with the huge connections and cables which may be dangerous.

So, it is important to know the requirement of your application. How much time do you need the batteries to run before they drain out? Calculate the time from the capacity of the batteries in parallel and stick to it.  

If you need to improve the overall voltage while the amp/hour isn’t a concern, you may be interested in how to connect batteries in series.

Frequently Asked Questions (FAQs):

Do Batteries Connected In Parallel Last Longer?

Batteries of the same voltage and amperage if connected, they seem to last longer with the same voltage. For example, if two 6v 12AH batteries are connected, the resultant would have 6v and 24AH capacity which will back you up longer.

How To Connect Two 12 Volt Batteries In Parallel?

The connection of all batteries in parallel is the same. You have to connect the positive terminal of a 12v battery to the positive and negative terminal to the negative of the other 12v battery to connect them in parallel.

Does Connecting Batteries In Parallel To Charge Increase Amp Hours?

Connecting two or multiple batteries in parallel leads to an increase in the amp-hour capacity in general. However, the voltage will remain the same.

What Happens If You Connect Two Non Identical Batteries In Parallel?

It is recommended to connect two identical batteries in parallel. This is because, when you connect two non-identical batteries, the higher charged battery will charge the lower-charged battery to balance which will not serve your purpose.

Final Thoughts

Well, how to connect batteries in parallel to extend runtime is quite straightforward as mentioned in this article. If followed properly, anyone can do this unless he is familiar with the positive and negative terminals.

I hope this article helps you connect parallel battery properly. If so, don’t forget to share with your friends! Also, you can comment down below for more queries.

You’re welcome.

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