The battery is a fundamental factor that determines the sustainability of a balance car. Judging from the current use of balance car batteries on the market, most of them use 18650 lithium batteries, and very few use polymer batteries.

　　As the saying goes, the balance bike runs far, it depends on the battery! If there is no electricity, the balance car will not be able to play. The battery is a fundamental factor that determines the sustainability of a balance car. Many balance scooter manufacturers are very confident when they describe the mileage of their balance scooter. The driving range is 20 kilometers, and there are even those with a standard range of 60 kilometers. As long as you move your toes to think about it, if you can walk 60 kilometers continuously, what a big battery?

　　Judging from the current use of balance car batteries on the market, most of them use 18650 lithium batteries, and very few use polymer batteries. But basically for these two categories, let's talk about 18650 first.

　　What is 18650? 18650 is a type of lithium battery. The diameter of this battery is 18mm, the length is 65mm, and it is cylindrical. Most of our laptop batteries use 18650 batteries.

　　The famous Dahongpao

　　In order to save costs, Sony made this size. And because of the 18650 lithium battery's stability, high capacity, no memory, environmental protection, etc., Ni-MH batteries are gradually being driven out of the digital world! So who, Tesla cars use Panasonic 18650 batteries.

　　The point is here. We often say that there are two kinds of 18650, one is lithium cobalt oxide, and the other is lithium iron phosphate. Of course, there are other metals such as manganese. Let's not care about these details for the time being. Because the standards produced by each company are different, and the materials used are different. This leads to a certain difference in the capacity of lithium batteries.

　　Like the relatively large companies in the industry, Panasonic, Samsung, and Sony also achieved the highest 18650 capacity of 3400mAh. Most of the capacity is between 2200mAh and 3000mAh.

　　There is another criterion to consider the use time of the 18650, which is the minimum discharge termination voltage. For example, the nominal voltage of a section of 18650 is 3.7V, its maximum charging voltage is 4.2V, and the minimum discharge termination voltage is generally 2.75V. This means that when the battery is charged, it will be full when it reaches 4.2V at most, and that is what it takes to charge it again. When discharged to 2.75V, the battery is dead. Why do you say this? Let's take a look at the battery on the balance car. In general, it is impossible for our balance car to use one battery. Any 18650 battery is composed of many batteries in parallel and several in series to form a battery pack. Generally, a regular manufacturer will mark how much V the battery has.

　　For example, a three-series and two-parallel 18650 battery pack, that is, six cells are divided into two groups, three each, and three or three are connected in series and then connected in parallel. The final label parameter of the battery pack is 11.1V/4400mAh. 11.1V=3.7V×3, the total capacity is 4400mAh=2200mAh×2. Dozens of 18650 batteries may be used on the balance car, and several strings and several are combined to form a large-capacity battery pack. If you want to calculate, you have to go to their engineers.

　　Three strings and two parallel batteries for notebooks

　　In series to increase the voltage, and in parallel to increase the capacitance. This makes the battery pack of the balance car relatively high voltage and large capacitance. However, general manufacturers will not label these data in detail. Otherwise, you don't need to ride a bike, and you can roughly know how far the bike can go based on the battery voltage and motor power. The battery life false mark will be exposed! There is a safety issue. Pay attention to the fact that there are so many batteries in a battery pack, and it is okay to connect them in parallel. As long as one of the batteries in series is unstable or mismatched. It is extremely prone to overdischarge and overcharge. Generally, battery packs have a circuit protection board to ensure safety. However, some batteries have problems and some dangers occur. This situation has occurred many times in power banks. It deserves attention! You know that the battery of a balance car is N times that of a power bank!