The battery will "age" after a period of use. The specific performance is that the internal resistance becomes larger. When charging, the voltage at both ends rises faster, so that it is easy to be judged to be full by the charging control circuit, and the capacity is naturally "decreased". Since the internal resistance of the battery is relatively large, the voltage drop during discharge is large and the speed is fast. The system is easy to mistakenly believe that the voltage is insufficient and the power is insufficient ( in fact, there is no electric discharge ) . From the above description, it can be seen that the aging of the battery is a vicious cycle. When it is found that the battery working time falls faster, it should be exercised, otherwise it will be finished sooner or later . In addition, many lithium battery failures are caused by the failure of a certain battery cell in the battery pack, and a mouse smashes a pot of soup. This phenomenon is unavoidable because the nature of each cell of the battery may not be exactly the same. After a long time, there are some poor quality first aging, which destroys the overall ( after series ) discharge curve. Simply put, the bad cell charge is full first, and the discharge is discharged first. At this time, the capacity of other cells is not fully utilized. Overcharging / overdischarging of a cell will not cause the monitoring circuit to consider the entire battery to be fully charged / discharged. For example, when charging, when other cells start to approach full charge voltage, the bad cell may have reached the terminal voltage of 4.30V or higher, causing overcharge damage, while others are not full. Editor's Note: For the treatment of battery internal cell damage, "China Computer Education News" in the second issue of 2001 has a very good article - "laptop battery DIY " is worth learning. Friends who are interested, guts and ability can try to open the battery pack. I believe that with the help of the multimeter, you can quickly find the damaged battery ( voltage abnormal ) . If the conditions permit, replace the qualified product according to the corresponding parameters of the battery core. Battery charge and discharge When charging a lithium-ion battery , it is quickly charged in a constant current mode. After the voltage reaches a certain value, it is slowly charged in a constant voltage mode. Usually laptops do not have a strict constant current charging monitoring device. When the system load is large, the charging current is small, and vice versa. This current is determined by the power headroom of the AC power adapter. Obviously, when the system is charging, the battery competes with other components, such as CPU , hard disk, LCD, etc. for energy. I tried to run Super π while charging, and found that the charging current varies between 0.70 and 1.70A , which can not meet the charging requirements of lithium-ion batteries, so I am worried that the charging will damage the battery during this work. The IBM manual requires that you do not operate the laptop while charging it. This may be the case. When charging and charging, if you can choose the charging mode, do not select the Express charge mode to avoid the battery being “full†too early. There is also the prohibition of using the highest performance of the CPU when the battery is low , in order to reduce the competition for power. If the CPU used in the notebook is supported by SpeedStep technology, it is best to install the driver ( which will be installed by the responsible manufacturer ) to facilitate performance adjustment. The icon of the SpeedStep program is a blue flag. Right click on it to display the performance adjustment options. Under Windows XP , the SpeedStep program will have problems. At this time, you can only rely on modifying the BIOS parameters or some brand-specific adjustment programs. For example , the tools of IBM laptops are very powerful. It is still a good idea to discharge the lithium battery and let it discharge naturally. It is best not to use physical methods ( string resistors, etc. ) . It is not that this is not the case, but the danger is relatively large. If the internal protection circuit does not work, the whole battery will be invalidated. The worst possibility is that the battery explodes. Of course, this possibility is very small. It is not impossible for the hidden dangers of the circuit to cause danger. Some big-name manufacturers have discovered the potential risk factors in the design and recovered the battery. As for the explosion of the mobile phone battery, it is heard from time to time. Tip: Generally speaking, the parts of the protection circuit of the laptop battery are usually the voltage regulating block, the control chip, the insurance, the temperature probe and the like. The temperature protector is usually disposable and has a fuse inside ( some are blown at 130 °C ) to monitor the operation of the surge block. If the charging and discharging process is abnormal, a current will pass through the temperature protector and the fuse will be blown. The internal circuit of the battery is now open and cannot be recovered. If you want to repair only the temperature protector, but this type of temperature protector is hard to find on the market. Discharge is to discharge as little current as possible. The operation is to let the CPU slow down, the hard disk stops, the screen is the darkest ( or close ) , then do not run any programs until the laptop automatically shuts down. The reason why the small current discharge is emphasized is to prevent the laptop from detecting the battery voltage too early. Storage Canister,coffee storage canister,food storage canister,best canister vacuum Jiangmen Sengho Houseware Co.,LTD , https://www.senghohousewares.com