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Hello everyone, today we will learn about the laptop battery

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Common laptop batteries include 18650 lithium batteries and lithium polymer batteries

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In a laptop, the main function of the battery is to provide

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a long-lasting battery life for the laptop

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The battery consists of a control board, a combination of battery cells and a shell

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Laptop batteries are composed of multiple cells

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through different parallel and series connections.

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For 18650 lithium battery, the voltage of each cell is 3.6V or 3.7V

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The charging voltage of a single cell is 4.2V

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Like this, it is three batteries in series, and then another group in parallel,

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this is called three series two parallel

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After connecting in series, its voltage will increase,

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and after three batteries are connected in series, it is 11.1V

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If we want to charge this battery pack,

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we need a voltage above 12.6V,

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because these are three cells in series

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So series can increase the voltage, parallel can increase the capacity

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For the number 18650, 18 means its diameter is 18mm,

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65 means its length is 65mm, and 0 means it is cylindrical

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So that we call it 18650

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The disadvantage of this kind of battery is that it's not suitable for ultrabooks

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Because its volume is fixed

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Well, this is the introduction of 18650 battery,

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let's take a look at the lithium polymer battery

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it is a kind of chemical battery

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It has the advantages of high energy density, no leakage,

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good impact resistance, miniaturization and light weight

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This battery has no standard capacity, no standard size

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It can be built according to the space inside the machine

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Its thickness can be as small as 0.4 mm or less

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So this lithium polymer battery is suitable for ultrabooks