6LR61 battery.Application technology: clever use of laptop batteries

　　The use of rechargeable batteries is one of the advantages of laptops over desktops, which greatly facilitates the use of laptops in various environments. The earliest battery introduced was the nickel-cadmium battery (NiCd), but this battery had a "memory effect and had to be discharged before each charge. It was very inconvenient to use. It was soon replaced by the nickel-metal hydride battery (NiMH). Not only did NiMH not have " Memory effect, and can provide 10% more power per unit weight. The most commonly used battery at present is lithium-ion battery (Li-Ion), which also has no "memory effect". Compared with NiMH, it can obtain more power per unit weight and the price is twice as high as NiMH. At the same weight, The usage time ratio of these three batteries is 1:1.2:1.9.

　　Currently, there are three main types of batteries used in laptop computers: 1. Nickel-chromium batteries, 2. Nickel-metal hydride batteries, and 3. Lithium batteries; they are generally represented as: nickel-cadmium NI-CD, nickel-hydrogen NI-MH, and lithium battery LI.

　　When buying or replacing laptop batteries, "battery cell" may be unfamiliar to many users. First of all, it should be stated that battery cell and battery are two different concepts. A battery is composed of several cylindrical cells slightly larger than the thumb. , about 7.8 cm high, composed of small units with a voltage of 3.6v. They are cells, just like small batteries. After being connected in series, they become the batteries we see. Next, let’s talk about how to judge the battery quality. Core:

　　One way: pull out the battery and look at the number of contacts. The number of contacts indicates the number of cores. But this is the "minister's method." Let's take a look at how "Cao Chong" weighs elephants: Take a look at the nominal number of V of your battery, such as 14.4v, and then divide it by 3.6 to get 4, which proves that it is 4 batteries. Connect them in series. Then look at the capacity of the entire battery, such as 3800mAh, which proves that there are two sets of the series-connected battery packs mentioned above, because those small batteries have a capacity of 1500-2000mAh or even more, and two sets are required to reach 3800mAh. According to these two judgments, this battery is 4×2=8 cells.

　　Laptop battery composition

　　Laptop batteries are composed of casing, circuit board and battery cells, and are lithium-ion batteries. Generally speaking, the cell refers to the number of cells in the battery, and mAh refers to the capacity of the laptop battery.

　　The circuit board is mainly composed of a protection circuit (or secondary protection circuit) and a capacity indication circuit, which manages the charge, discharge and safety of the laptop battery.

　　The standby time of a laptop battery is mainly determined by the mAh value. Generally speaking, the greater the number of cells, the greater the mAh value and the longer the standby time. The life of a laptop battery is mainly measured by the number of charges and discharges. Products with qualified quality are generally 500-600 times. Therefore, the effective service life of a laptop battery is less than 2 years. Expired batteries will age and the standby time will drop sharply, which will affect the mobility of the laptop.

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