18650 batteries for laptops generally have a capacity of 2200 mAh (mAh), a voltage: 3.7 V
a current of 2200 mA (mA) and can be used for 1 hour (hour).
The highest specification capacities are 2400 mAh and 2600 mAh (most are Sanyo batteries and most Sony laptops use 2600 mAh specifications).
The following takes the common 3.7V/2200mAh battery cell as an example.
1. The battery commonly known as a three-cell battery is a battery made up of three 18650 cells connected in series. The final marked parameters of the battery are 11.1V/2200mAh. 11.1V = 3.7V × 3, the output current remains unchanged when connected in series.
There are also those marked 10.8 V, that is, a voltage drop occurs in a single cell, resulting in a reduction in the total voltage.
Most netbooks popular on the market are now equipped with batteries meeting this specification.
There are two situations for two-cell and four-cell batteries: four in series and two in series and two in parallel.
The last marked parameters of the four batteries connected in series are: 14.8V/2200mAh. 14.8V = 3.7V × 4. When connected in series, the output current remains unchanged at 2200mAh.
Two series and two parallel means that four batteries are divided into two groups. Two pairs are connected in series then in parallel. The final marked parameters of the battery are: 7.4V/4400mAh. 7.4V = 3.7V × 2, output current is 4400mAh = 2200mAh × 2.
Most mid-sized laptops (12.1 inch, 13 .3 inch, etc.) on the market now have batteries of this specification.
Detailed information:
Look at the namebre 18650. In fact, it represents the size 18 means that the battery has a diameter of 18 mm, 65 means that the length is 65 mm and the last 0 means that the battery is cylindrical in shape. There are generally three types of 18650 batteries: lithium-ion batteries, lithium iron phosphate batteries, and nickel-metal hydride batteries.
The 18650 standard is a standard-shaped lithium-ion battery model established by the Japanese company SONY in its early days to reduce costs.
Advantages:
① Large capacity: a lithium battery cell has at least 1200mah, even 3600mah, while ordinary battery cells only have 'about 500;
< p>② High energy storage efficiency and good stability: the full output power can be maintained in an environment of 70°, and there are generally internal protection circuits to prevent the battery from running out③ There is almost no effand memory: during charging There is no need to discharge all the remaining power before use, it can be charged or discharged at any time, easy to use;
④High charging cycle life and discharge: lithium batteries can be cycled tens of times thousands of times and have good high temperature resistance;
⑤Environmentally friendly, free of toxic substances: non-toxic, harmless, non-polluting, RoHS certifiedQuantity certification.
Lithium batteries are usually not used in one, but in several strands. We often call them batteries. This type of battery often appears in our daily life, such as our laptop batteries, external batteries and electronic batteries. . Wireless digital equipment for printer, portable products, intercom communications, lithium batteries for POS machines, etc. At present timeCurrently, the base capacity of many batteries is 2,200 mah.
The following is the specification table of Sanyo brand lithium batteries. Generally, the best batteries have four main protection functions:
①Overcharge protection: When the lithium battery is overcharged When the overcharge voltage of the battery reaches a certain value or period of time, the function Overcharge protection will take effect and automatically stop charging to protect the battery;
② Over-discharge protection: Over-discharge means the battery is in a constant overcharge output state. Usually there is protection against discharge. At this time, the battery will be in standby mode;
③ Overcurrent Protection: This overcurrent protection value can adjust the number of amps for some things. choose the setting according to thea real situation
④Short circuit protection; When the battery is short circuited, the overcurrent will act to protect the battery from burning.
In addition to these four protection functions, some also have temperature, equalization and other functions. The battery usually has a built-in PCM protection system with several protection functions.
Baidu-18650 Encyclopedia Lithium Battery