What does Ah lithium battery mean?

AH simply means capacity.

Battery capacity is usually measured in amps and hours. The formula for calculating the capacity of battery C is C=I∫t0tdt. Battery capacity is divided into actual capacity, theoretical capacity and rated capacity depending. different conditions. The minimum capacity required to discharge to the final voltage at 25°C at a certain discharge rate is the battery capacity specified at the time of design and production. This is called the nominal capacity of a certain RH discharge rate.

Note:

“Amps-hours (AH)” is an indicator that reflects the capacity of the battery, which means that it is discharged depending on the specified current. time. For batteries with the same voltage, the one with higher amp-hours has greater capacity; for batteries with the same amp-hours, the one with thehigher voltage has greater capacity. Battery capacity is usually expressed by both voltage and amp hours. , such as 12V/17Ah, 12V/24Ah, 12V/38Ah, 12V/65Ah, 12V/100Ah.

What do the 300mah 25c markings mean on 3.7V lithium battery?

Rated capacity refers to the capacity of the motor or electrical appliance listed on the nameplate which can continue to operate for a long time under rated working conditions. These are generally apparent power for transformers, active power for motors, and apparent or reactive power for phase modulated equipment. The units are VA, kVA and MVA.

The rated capacity refers to the usual value of the apparent power under the main tap. For example, the capacity specified on the transformer nameplate is the capacityrated tee, which means that the tap changer is located at the main tap and is the product of the rated no-load voltage, rated current and the corresponding phase coefficient. For three-phase transformers, the rated capacity = rated no-load line voltage × rated line current, and the rated capacity is usually expressed in kVA or MVA. Rated capacity is the maximum capacity that can be produced continuously over the specified normal life, for example 30 years. The actual output capacity is the product of the voltage with load (in the case of an inductive load, the voltage with load is lower than the nominal no-load voltage), the nominal current and the corresponding coefficient.

Why do 18650 lithium batteries have different capacities?

300mah is the battery capacity. To put it simply, if it is discharged with a current of 300ma, it can work for1 hour, and if discharged with a current of 30ma, it can work. work for 10 hours. The C in 25C represents the discharge rate, and 25 is the rate, which is the charge and discharge rate of 25 times. To put it simply, 300mA X 25 times = 7500mA = 7.5A, which is the maximum charge and discharge rate.

18650 is one of the most commonly used lithium batteries. 18650 represents a cylindrical battery with a diameter of 18 mm and a length of 65 mm. It is widely used in electric vehicles, flashlights and uninterruptible power supplies. and other occasions.

18650 batteries have different voltage ratings depending on the battery type. Take a common lithium-ion battery as an example. Its nominal voltage is 3.7 V, its saturation voltage is 4.2 V and its conventional capacity is 2600 mAh. However, batteries differdifferent manufacturers or batteries of different models from the same manufacturer will do this. have different nominal capacities. Common capacities include 2000 mAh, 2200 mAh, 2600 mAh, etc. Batteries of different capacities will have different manufacturing costs. Currently, the conventional capacity of 2000 mAh is considered low capacity. There are also less expensive batteries with capacities of 1500 mAh or even lower. 18650 cans. The highest capacity achieved is around 3400 mAh.

In fact, it's not just 18650 batteries. Other types of batteries, even if they are the same size, will have different capacities. This is related to the manufacturing process of the battery, the materials used, etc. There are differences in manufacturing costs for batteries of different capacities, which will cause differences in sales prices. LorWhen choosing a battery, you must make a choice based on factors such as actual capacity requirements and cost.

Although different capacities can be obtained by connecting batteries in parallel, when the space is relatively fixed, you should consider choosing batteries of different capacities. Some need to use larger capacities, and some only provide electrical power. but for parameters such as capacity, they are not demanding. In fact, besides the differences in rated voltage and capacity of 18650 lithium batteries, another important parameter is the discharge rate. This parameter determines the instantaneous and long-term output current of the battery, so 18650 batteries are generally divided into capacity type and power type. Capacity type batteries focus on capacity and are generally used in situationswhere long term low current discharge is required; Power type batteries require instantaneous or continuous discharge current and are generally used in situations where the operating current is relatively large, such as power tools, etc.

The main reason that batteries of the same size will have different capacities is due to manufacturing cost. Considering this problem, it is necessary to make a reasonable choice according to the actual situation. As for the 5500mAh, 9800mAh, 12500mAh and other capacity batteries mentioned in the question, this is not realistic for a single 18650. These batteries are all batteries with virtual capacity standards. To achieve this capacity, you must use multiple batteries in parallel. reached.