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As the saying goes, a balanced car can run far and rely entirely on batteries for power supply! If there is no electricity, the balance car cannot be played. The battery is the fundamental factor determining the sustainability of a balanced vehicle. Many balance car manufacturers are very confident in describing the range of their balance cars, with a range of 20 kilometers and even a standard range of 60 kilometers. As long as you move your toes to intention, how much battery would it take to continuously walk 60 kilometers?

From the current usage of balance car batteries on the market, the vast majority use 18650 lithium batteries, with very few using polymer batteries. But basically, for these two categories, let's first talk about 18650.

What is 18650? 18650 is a type of lithium battery with a diameter of 18mm and a length of 65mm, forming a cylindrical shape. Most of our laptop batteries use 18650 batteries.

The famous Dahongpao

Back then, Sony created this size to save costs. And due to the stability, high capacity, no memory, and environmental friendliness of 18650 lithium batteries, they have gradually pushed nickel hydrogen batteries out of the digital world! Who is that? Tesla cars use Panasonic's 18650 battery.

Here's the key point. There are two types of 18650 that we often talk about, one is lithium cobalt oxide, the other is lithium iron phosphate, and of course, there are still metals like manganese. Let's not worry about these details for now. Because each company produces different standards and uses different materials. This has led to certain differences in the capacity of lithium batteries.

Several companies in the industry, such as Panasonic, Samsung, and Sony, have also achieved a maximum capacity of 3400mAh from 18650. Most of the capacities are between 2200mAh and 3000mAh.

Another criterion for considering the usage time of 18650 is the minimum discharge termination voltage. For example, a 18650 has a nominal voltage of 3.7V, a maximum charging voltage of 4.2V, and a minimum discharge termination voltage of 2.75V. This means that when the battery is charged, it can be fully charged up to 4.2V, and then it needs to be charged again. When discharged to 2.75V, the battery runs out of charge. Why do you say these things? Let's take a look at the batteries on the balance car. Normally, it is not possible for our balanced car to use a single battery. For those using 18650, many batteries are connected in parallel or series to form a battery pack. Generally, reputable manufacturers will label the voltage of the battery.

For example, a 18650 battery pack with three series and two parallel connections, which consists of six cells divided into two groups of three each, connected in series and then connected in parallel. The final indicated parameter of the battery pack is 11.1V/4400mAh. 11.1V=3.7V x 3, with a total capacity of 4400mAh=2200mAh x 2. A balanced car may use dozens of 18650 batteries, several in series, to form a large capacity battery pack. If you want to calculate, you need to find their engineers.

Three series and two parallel batteries for laptops

Series connection increases voltage, parallel connection increases capacitance. This results in a relatively high voltage and large capacitance of the balanced car battery pack. But generally, manufacturers do not label these data in detail. Otherwise, you can skip cycling and get a rough idea of how far the bike can go based on the battery voltage and motor power. The false battery life mark is exposed! There is a safety issue to pay attention to when there are so many batteries in a battery pack, it's okay to connect them in parallel. Only one battery in series has an unstable or mismatched voltage. Overdischarge and overcharging are extremely prone to occur. Generally, battery packs have a circuit protection board to ensure safety. However, there are also some batteries that have problems and pose some dangers. This situation has occurred many times in power banks. Worth attention! You should know that a balanced car battery is N times that of a power bank!

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