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can i charge 2 12v batteries in parallel

Can I Charge 2 12V Batteries in Parallel?

Many individuals who use 12V batteries often wonder if they can charge two of these batteries in parallel. This article aims to answer that question while also providing useful information on the topic.

The Basics of Charging Batteries in Parallel

When it comes to charging batteries in parallel, it is important to note that both batteries must have the same voltage. In this case, since we are dealing with 12V batteries, it is possible to charge them in parallel. Simply connect the positive terminal of one battery to the positive terminal of the other using a jumper wire. Likewise, connect the negative terminals together. This parallel configuration ensures that both batteries receive the same amount of voltage during charging.

The Benefits of Charging Batteries in Parallel

Charging batteries in parallel can provide several benefits. Firstly, it allows for a longer runtime. By connecting multiple batteries in parallel, you are essentially increasing the overall capacity of your battery bank. This makes it ideal for applications that demand a long-lasting power source, such as RVs or boats.

Another advantage is the ability to balance the charge between the batteries. If one battery has a lower charge than the other, the presence of a parallel connection allows the higher-charged battery to supply the required charge to the lower-charged battery. This ensures that both batteries are properly charged and helps prolong their lifespan.

Considerations and Precautions

While charging batteries in parallel can be advantageous, it is essential to take certain precautions. Ensure that both batteries are of the same brand, type, and age. Mixing batteries with different specifications can result in an imbalance during charging, leading to a decrease in performance or potential damage to the batteries.

Furthermore, it is crucial to use a suitable charger. Look for a charger that is designed for parallel charging or one with a multi-bank setting, allowing for simultaneous charging of multiple batteries. This will ensure that each battery receives an equal and appropriate amount of current during the charging process.


In conclusion, it is possible to charge two 12V batteries in parallel. By connecting the batteries using jumper wires in a parallel configuration, you can increase the overall capacity and runtime of your battery bank. Remember to take the necessary precautions, such as using batteries of the same specifications and a suitable charger, to ensure a balanced and safe charging process.

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