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A battery that reaches twelve volts but is less than 20ah may not be able to drive.
20ah is the capacity of the battery, not the power. When the current is constant, the larger the capacity, the longer it can be used for power supply.
The meaning of 20ah is that when the battery output current is 20 amps, it can be used for 1 hour, or it can be understood as when the battery output current is 2 amps, it can be used for 10 hours, etc. The product of current and time is 20
When the device requires a high-power battery of 20ah to drive, it indicates that the device has a high operating current, and small capacity batteries may not be able to withstand this high current. If a small capacity battery can withstand the driving current of the device, it can be driven. Just like how you connect more than ten seventh batteries in series to drive an electric bicycle, it cannot be driven.
Firstly, the 18650 battery has a cylindrical shape with liquid inside. Due to the characteristics of battery design and raw materials, the power type 18650 battery is suitable for high current discharge. Therefore, almost many high-power products on the market use 18650 lithium batteries. However, ultra-thin laptops, especially tablets, etc., do not use 18650 batteries because they require a thin appearance and instead use polymer lithium batteries. However, high-power digital cameras are different because the charging and discharging of flashlights require high voltage and instantaneous high current, so only 18650 power type lithium batteries or other types of power batteries can be used, although the volume is slightly smaller. For example, 18500 power lithium batteries are commonly used in digital camera products; With the advantages of high energy density and high current discharge of 18650 power lithium batteries, electric vehicles are now designed with 18650 power lithium batteries
The advantages of polymer lithium batteries are small size and large capacity, but the disadvantage is that their lifespan is shorter than 18650. Due to the use of different designs and materials, some have liquid inside, while others are dry or colloidal. Moreover, their performance during high current discharge is not as good as cylindrical batteries like 18650. Therefore, large capacity and small volume electrical equipment are required, and polymer lithium batteries are usually used. The most typical performance is in devices such as mobile phones and tablets.
Rechargeable battery is a rechargeable battery with limited charging times, used in conjunction with a charger. On the market, they usually sell the 5th and 7th, but there are also the 1st. The benefits of rechargeable batteries are economy, environmental friendliness, sufficient power, and suitability for high-power, long-term use of appliances such as portable music players and electric toys. The voltage of a rechargeable battery is lower than that of a disposable battery of the same model. The AA battery (5th charge) is 1.2 volts, while a 9V rechargeable battery is actually 8.4 volts. Nowadays, the average charging frequency is around 1000 times. As of February 2012, there were only five types: nickel cadmium, nickel hydrogen, lithium-ion, lead storage, and iron lithium.
The active material on the positive plate of lead-acid batteries is lead dioxide, and the active material on the plates is sponge like pure lead. The electrolyte is a certain concentration of sulfuric acid solution, and the electromotive force between the plates is about 2V
The active material on the positive electrode plate of nickel cadmium batteries is nickel oxide powder, and the active material on the negative electrode plate is cadmium oxide powder. The active materials are wrapped in perforated steel strips and pressed to form the positive and negative plates of the battery. The electrolyte is usually potassium hydroxide solution The open circuit voltage of the battery is 1.2V
The positive electrode material of nickel metal hydrogen battery is nickel oxide powder, the negative electrode material is hydrogen absorbing alloy, and the electrolyte is potassium hydroxide solution., The open circuit voltage of the battery is 1.2V Lithium ion batteries use LiCoO2 composite metal oxides to form anodes on aluminum plates, lithium carbon compounds to form cathodes on copper plates, polyolefin film separators with submicron sized micropores between the plates, and organic solvents as electrolytes The open circuit voltage is 3.6V
Lithium polymer batteries are an improved version of lithium-ion batteries that use polymer electrolytes instead of battery fluids, making them more stable than ion batteries Open circuit voltage 3.6V
The battery capacity represents how much power the battery can store, and the numbers we see on the battery packaging generally refer to the battery capacity label. Expressed in ampere hours or milliampere hours. It is a composite unit composed of the product of current units and time units, representing the ability of a battery to discharge continuously at a constant current. A fully charged battery can last for 10 hours when discharged with a current of 200mA. Multiplying the current by time yields a capacity of 2000mA for this battery H. If it is discharged with 400mA, the available time is 5 hours.
Energy density: The capacity of electrical energy contained per unit volume or unit weight. For the same amount of electricity required, a battery with high energy density can have a smaller volume and lighter weight.
C current: refers to the amount of current required to discharge a fully charged battery or fully charge a depleted battery within one hour. In fact, it is the numerical value of ampere hour capacity. 1800mA. The capacity of the battery, C current is 1800mA. 2000mA. The capacity of the battery has a C current of 2000mA.
Open circuit voltage: refers to the potential difference between the two poles of a battery.
Memory effect: The new battery, with its electrode material having fine grains, can achieve the maximum electrode surface area. Due to use, the contents of the battery crystallize, and after crystallization, the grain size increases, also known as (passivation), which reduces the available electrode area. Moreover, the grown grain size can cause an increase in self discharge, resulting in a decrease in battery capacity and performance damage. This is the memory effect. The reason for the occurrence of memory effect is due to incomplete repeated partial charging and discharging of the battery.
Self discharge rate: After charging, the battery will gradually lose its power even when not in use, and the higher the temperature, the more significant the self discharge.
Nickel cadmium
（Ni-Cd）
Voltage: 1.2V, service life: 500 times
Discharge temperature: -20 ° C to 60 ° C
Charging temperature range: 0 ° C to 45 ° C
ni-mh
（Ni-MH）
rechargeable battery
rechargeable battery
Voltage: 1.2V
Service life: 1000 times
Discharge temperature: -10 ° C to 45 ° C
Charging temperature: 10 ° C to 45 ° C
Note: Currently, the highest capacity of domestically produced No. 5 batteries is around 3000mAh.
Lithium ion
（Li-lon）
rechargeable battery
rechargeable battery
Voltage: 3.6V
Service life: 500 times
Discharge temperature: -20 ° C to 60 ° C
Charging temperature range: 0 ° C to 45 ° C
Note: The weight is 30% to 40% lighter than nickel hydrogen batteries, and the capacity is more than 60% higher than nickel hydrogen batteries. But it is not resistant to overcharging, as overcharging can cause excessive temperature and damage the structure, resulting in an explosion.
Lithium polymer
Voltage: 3.7V
Service life: 500 times Discharge temperature: -20 ° C to 60 ° C
Charging temperature range: 0 ° C to 45 ° C
Note: The improved version of lithium batteries does not use battery fluid, but instead uses polymer electrolytes, which can be made into various shapes and are more stable than lithium batteries.
Lead acid battery
Voltage: 12V
Service life: 200-300 times
Discharge temperature: 0 ° C to 45 ° C
Charging temperature range: 0 ° C to 45 ° C
Note: It refers to a general car battery (which is composed of 6 2V connected in series to form 12V). The battery without adding water has a service life of up to 10 years, but its volume and capacity are the largest.
Feature Editing
Nickel cadmium: has memory effect and small capacity
Nickel hydrogen: small memory effect, large capacity
Lithium ion: No memory effect, thin body, large capacity. Due to different electrode materials, the electromotive force is 3.6V and 3.7V. The performance of lithium batteries is the best among all existing types of batteries, with small size, light weight, and large capacity. Widely used in electronic products such as digital cameras, laptops, and mobile phones.
Lead storage: The electromotive force is about 12V, and lead-acid batteries can be repeatedly charged and used. The electrolyte is sulfuric acid solution, with low internal resistance, and are widely used in automobiles and motorcycles.
Lithium iron: More powerful, safer, and lighter, the main development direction for electric vehicles in the future.
Generally, for the same type of rechargeable battery, the larger the capacity, the larger the volume, and the heavier the weight.

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