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There is a relationship between battery voltage and capacity, but it is non-linear, so it is not feasible to use battery voltage to determine battery capacity. Non linearity cannot be described using charts, or it is difficult to accurately connect the two using formulas.

Generally speaking, when the battery voltage is significantly lower than the rated value, the capacity is basically close to zero.

However, there seems to be a battery capacity tester available on the market, with over 7000 units. The principle is roughly to reflect the degree of response change of the battery by using high-frequency signals to jump.

It seems that you don't really understand batteries! It can be said that the capacity and voltage of the battery have nothing to do with it!

The voltage of a battery is only related to its material, such as a 3.7V lead-acid battery, a 2V zinc manganese battery, a 1.5V nickel hydrogen battery, a 1.2V battery, etc. As long as it is a single cell, this voltage will not change. Some cars and electric vehicles you see have 12V batteries, but in fact, there are 6 batteries inside!

For example, voltage=water pressure capacity=water area. Is there a relationship between water pressure and water area?

To say how much electricity a battery can hold, one must say how much V and how much AH it can hold. For example, a 12V10AH battery is the true capacity!

The driving range of an electric vehicle (based on "endurance time") is related to the power of the electric motor and also to the power supply capacity of the battery. That is, the endurance time is: the power supply capacity of the battery (voltage x capacity, i.e. 60V x 20AH=1200Wh) ÷ the motor power (W), and the calculated result is hours.

When the capacity of the battery is constant, the voltage of the battery is basically proportional to the range.

The range of an electric vehicle is related to the electrical energy of the battery, and the product of the nominal voltage and capacity of the battery is the electrical energy of the battery. It should be said that under a certain capacity of the battery, the voltage of the battery is basically proportional to the range.

The voltage and current output of electric vehicle batteries determine the driving power of the electric vehicle. If the voltage and current output is high, the power will be strong, and the speed can reach the highest value. When the electric vehicle is driving at a constant speed, the voltage and current will maintain a relatively constant power output.

Electric vehicles are controlled by a controller to control power output. The controller issues instructions based on the required power during the operation of the electric vehicle, and the battery pack outputs power. Power=voltage * current. At a constant power, the higher the voltage and the lower the current, the constant power output is generally achieved when the electric vehicle is running at a constant speed. Therefore, electricity consumption is the most economical at this time (low current discharge leads to slow voltage drop). When starting or climbing waves, the power demand of the motor increases. As the running time prolongs, the voltage of the battery will decrease and the current will increase. Especially when the power consumption is above 50%, it will be very difficult. This is because when the current increases, the battery voltage will drop suddenly to the protection voltage of the controller, resulting in no power supply.

The starting current, climbing current, and threshold crossing current of an electric vehicle are 1.2-1.5C when riding at a constant speed. C is the 2-hour rate capacity of the battery. For example, if the battery capacity is 20AH, then this current is 25A-30A. High current discharge can cause certain damage to the battery and shorten the discharge time. If the power is slowly increased when starting, it will greatly reduce the damage to the battery and prolong the discharge time, thereby extending the driving range.

The methods to extend the mileage of electric vehicles are as follows:

1. When starting, it is advisable to slowly turn the handlebars, reduce the acceleration process, and drive at a constant speed as much as possible. On the one hand, this can extend the range, and on the other hand, it is beneficial for battery life.

2. Improve the configuration of electric vehicles and increase battery capacity. If you want good battery life, you can try to install batteries with larger capacity as long as there is installation space, which can extend the driving time.

Because electrical power=voltage * current. So the higher the voltage and current, the greater the electrical power. For batteries, it means storing more electricity. For electric vehicles, the more electricity a battery stores, the farther it can run, or the heavier it can be pulled and run faster. So the higher the voltage, the better it works, and the larger the current, the better it works.

Nowadays, the batteries of two wheeled electric vehicles generally have 36V (3 units), 48V (4 units), 60V (5 units), and 72V (6 units). There are two types of external specifications, namely large and small. The current of a large battery is about 20 amperes, and the current of a small battery is about 10 amperes. Small batteries are suitable for lightweight vehicles due to their small size. Scooters should use large batteries.

Batteries with the same appearance may have different labeled current capacities, but high-quality brands do have higher current capacities. There are also miscellaneous brands with disorderly labels.

The higher the voltage (only a few), the heavier the vehicle body, and the higher the cost of battery replacement. A large battery weighs more than a small battery and is more expensive than a small battery.

Electric vehicles are divided into two types: electric and electric motorcycle. The mileage of electric vehicles is determined by the capacity of the battery pack. Firstly, for electric vehicles, a 48V12A battery can run about 40 kilometers, a 48V20A and 64V12A battery can run about 70 kilometers, a 48V28A battery can run from 48V30A to 60A. The distance between 60V20A and 64V20A is about 90 kilometers, and the distance between 72V20A is about 120 kilometers. The distance between 48V20A and 60V20A is about 40 kilometers, and the distance between 60V20A and 64V20A is only about 70 kilometers. Electric vehicles usually have a 350W controller and a 350W motor. The same battery pack, the higher the motor power, the greater the power of the electric vehicle and the less distance it can travel. That is to say, under the same voltage, the higher the ampere of the battery, the farther the electric vehicle can run. It depends on your situation now. If you have to run a long distance every day, then you should choose one with a higher mileage, otherwise you won't have enough to ride in a day. If you want to go faster and farther, choose a 64V or 72V battery, preferably one with a high amperage, as it consumes a lot of power. If it's just for commuting, don't expect too much. A 48V is sufficient, while a pedal electric car has a minimum of 20A. If it's not enough, you need a 30A because the lifespan of lead-acid batteries is limited. No matter how much V or A you have, the charging and discharging times of the battery are the same. In the future, your maintenance costs will also be much lower. I sell electric vehicles, and we also do the after-sales service ourselves. So if you have any questions, you can ask me.

From the perspective of the battery, I should buy one from Lu Jun because high voltage leads to high efficiency. If powered by 2V, the same capacity and output power can also be achieved. The loss of the circuit will be significant, and the efficiency will be very low. Also, a 6-volt 260AH battery has a smaller capacity than a 140AH-12V battery, it's smaller! Another issue is that low voltage motors have poor power performance, slow acceleration, and poor controller performance due to the need for high current operation. Nowadays, it is easy to achieve withstand voltage of several hundred volts for power transistors, but it is very difficult to make large currents, and power transistors will be very hot. Also, even a small electric bicycle motor with a voltage of 72 volts is coming out. Low voltage motors will definitely be eliminated.

It's actually difficult to answer your question because large capacity is not the only basis for choosing a voltage level. Just looking at the charge capacity, the former is naturally larger. As for the size of the capacity, you can actually understand it this way. The capacity multiplied by the voltage is the total energy stored by the voltage level. Therefore, the latter is larger than the former, but the voltage of the latter is higher, so the output power is also higher, and the car speed will be faster. So let's put it this way, the former is long-lasting, while the latter has a higher speed increase, depending on your needs. But you mainly buy electric vehicles, and you also need to pay attention to their quality and price

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