Chat with us, powered by LiveChat

will 2 12v or 2 6v batteries last long


When it comes to battery life, the voltage alone is not the sole determining factor. The capacity of the battery and the current draw of the device it powers are also critical factors. In this article, we will explore whether two 12V batteries or two 6V batteries will last longer under certain circumstances.

Understanding Battery Capacity

Before delving into the comparison, it’s vital to understand battery capacity. A battery’s capacity is measured in ampere-hours (Ah) and indicates the total amount of charge it can store. For instance, a 100Ah battery can deliver 1 ampere of current for 100 hours, or 10 amperes for 10 hours.

The Analysis: 2 12V vs. 2 6V Batteries

When comparing two 12V batteries to two 6V batteries, assuming both have the same capacity, the total energy stored will remain the same. However, there are certain advantages and disadvantages to consider for each configuration.

Firstly, two 12V batteries connected in series, meaning the positive terminal of one battery is connected to the negative terminal of the other, will provide a total voltage of 24V. This configuration is often used in applications requiring higher voltage, such as some electric vehicles. While the total voltage increases, the capacity remains the same. Therefore, the batteries will last the same amount of time as compared to one 12V battery of the same capacity.

On the other hand, two 6V batteries connected in parallel, with their positive terminals connected together and negative terminals connected together, will provide a total voltage of 6V but with double the capacity of a single 6V battery. This configuration is commonly used in applications demanding prolonged use, such as recreational vehicles. Since the total capacity doubles, the batteries will last longer compared to a single 6V battery.

It’s important to note that the actual lifespan of the batteries depends on the device they are connected to and the current draw of that device. If the device draws higher current, it will drain the batteries faster, regardless of their voltage configuration. Similarly, if the device draws lower current, the batteries will last longer. Therefore, it’s crucial to consider both voltage and current requirements when determining battery life.


Ultimately, whether two 12V batteries or two 6V batteries will last longer depends on the specific application and the current draw of the device. Two 12V batteries connected in series provide a higher voltage, while two 6V batteries connected in parallel offer a longer runtime due to higher overall capacity. However, the actual battery life will be influenced by the device’s current draw. Therefore, it’s essential to consider the specific requirements of the application before deciding which battery configuration will last longer.

Leave a Comment

Your email address will not be published. Required fields are marked *

Select your currency
USD United States (US) dollar
EUR Euro

Christmas Day Sweepstakes

  • Try Your Luck for Discount Coupons 1 spin per email Don't Cheat
Try Your Lucky
Remind later
No thanks