1. The battery itself is of poor quality
2. Use low-quality chargers
3. Long time operation in high temperature or low-temperature environment
4. The battery is connected to high-load peripherals, and the plugging is not standardized.
5. Excessive charging and discharging (the remaining power of the battery is less than 3%). The circuits are protected, but it happens occasionally.
6. Incomplete charging and discharging (not to recharge after using up, but to use and recharge if you want)
7. Long-term use of the battery in strong electromagnetic radiation (will interfere with the conductivity of the metal in the battery)
8. Long-term use of batteries in humid conditions (wet batteries will reduce performance)

For Windows 8 and above, you can enter powercfg /BatteryReport in the command prompt to view battery usage and consumption, or you can use hardware detection software (such as Everest) to see, and sometimes false alarms.

Lithium ion battery refers to a secondary battery composed of two compounds that can reversibly insert and extract lithium ions as the positive and negative electrodes. People call this kind of lithium ion battery with a unique mechanism that relies on the transfer of lithium ions between the positive and negative electrodes to complete the battery charging and discharging work.
“Rocking chair battery”, commonly known as “lithium battery”.

Lithium batteries usually have two appearances: cylindrical and square. The inside of the battery adopts a spiral wound structure, and a very fine and highly permeable polyethylene film separator is used to separate the positive and negative electrodes. The positive electrode includes a current collector composed of lithium cobalt oxide (or lithium nickel cobalt manganate, lithium manganate, lithium iron phosphate, etc.) and aluminum foil. The negative electrode is composed of a current collector composed of graphitized carbon material and copper foil. The battery is filled with an organic electrolyte solution. In addition, a safety valve and PTC components (partial cylindrical use) are also installed to protect the battery from damage when the battery is abnormal and the output is short-circuited.

The voltage of a single-cell lithium battery is 3.7V (3.2V for lithium iron phosphate anode), and the battery capacity cannot be infinite. Therefore, single-cell lithium batteries are often processed in series and parallel to meet the requirements of different occasions.

Notebook computer batteries are generally composed of casing, battery pack, charge and discharge control and protection circuits (to prevent overcharging and overdischarging).

Let me talk about the battery pack, which is the core component of the laptop battery. Generally, laptop battery cell use 10.8V or 11.1V, and a single battery cannot meet the requirements. Therefore, laptop batteries are battery packs composed of multiple single cells in series and parallel (as shown in the figure, two groups of 3 are connected in series and connected in parallel. Battery pack). As for the 3300mAh, 4400mAh, etc. that you often see in the battery shell, it refers to the battery capacity. It indicates that the current can be used for one hour when discharging the battery. For example: a 4400mAh lithium battery can be discharged at a current of 4400mA for one hour . So the larger the value, the better proof that it can work for longer.