Basic information on how to test and repair laptop batteries
October 13th, 2009
usadapter asked:
Laptop batteries differ from other types of batteries that provide a relatively short service life and are expensive to replace. In this article we look at the possibilities for tesing and repair, and also provide some information on batteries. In today 's world of every laptop is batteryis cells with li-ion battery as the Dell Inspiron 6400 (http://www.papatek.com/Dell-Battery/Dell-Inspiron-6400 -battery.html) has nine li-ion cells. Under good conditions, the lithium-ion battery provides 300 to 500 cycles of discharge / load or 2 to 3 years of service from the time the battery leaves the production line. The loss of capacity occurs with increased internal resistance caused by oxidation of the cell. The resistance eventually reaches a point where the battery can deliver more energy needed energy but can still be present in the battery. There are no remedies to restore the capacity when it is used. The heating of the battery momentarily improve performance. The basic knowledge you need to know in obtaining quick test readings is measuring the battery 's internal resistance, often referred to as impedance. The internal resistance measurements take only a few seconds to complete and provide a reasonably accurate indication of the condition? s of? the battery, especially if a reference reading a good battery is available for comparison. To measure the impedance, a battery must be at least 50 percent charged. An empty or nearly empty battery exhibits high internal resistance. As the battery reaches 50 percent SoC, the resistance drops, then increases again to Complete or full charge. The Table 13-1 shows the typical curve of the internal resistance of NiMH charging function. Note the decrease in impedance after the battery has rested for a while. To obtain accurate results, allow the battery to rest after unloading and reloading. Laptop batteries can be repaired but such work has only economic sense for smaller operators. The success rate varies with the type of battery. One must remember that the 'smart' battery consists of two parts, chemical cells and digital circuit. In some cases, the chemical can be fully restored but the fuel gauge may become inaccurate or other data can get corrupted. Anyone who tries to repair the SMBus battery should be aware of a certain failure in the SBS forum. Unlike other tightly regulated standards, the SMBus protocol allows some variations. This can cause problems with existing chargers and the SMBus battery should be checked to see if there are compatibility before use. The need to test and approve the junction between a specific battery and charger is unfortunate, given the fact that the SMBus battery is being promoted as being universal. Ironically, adding more features to the SMBus charger and battery, the higher the likelihood of incompatibilities.
Laptop batteries differ from other types of batteries that provide a relatively short service life and are expensive to replace. In this article we look at the possibilities for tesing and repair, and also provide some information on batteries. In today 's world of every laptop is batteryis cells with li-ion battery as the Dell Inspiron 6400 (http://www.papatek.com/Dell-Battery/Dell-Inspiron-6400 -battery.html) has nine li-ion cells. Under good conditions, the lithium-ion battery provides 300 to 500 cycles of discharge / load or 2 to 3 years of service from the time the battery leaves the production line. The loss of capacity occurs with increased internal resistance caused by oxidation of the cell. The resistance eventually reaches a point where the battery can deliver more energy needed energy but can still be present in the battery. There are no remedies to restore the capacity when it is used. The heating of the battery momentarily improve performance. The basic knowledge you need to know in obtaining quick test readings is measuring the battery 's internal resistance, often referred to as impedance. The internal resistance measurements take only a few seconds to complete and provide a reasonably accurate indication of the condition? s of? the battery, especially if a reference reading a good battery is available for comparison. To measure the impedance, a battery must be at least 50 percent charged. An empty or nearly empty battery exhibits high internal resistance. As the battery reaches 50 percent SoC, the resistance drops, then increases again to Complete or full charge. The Table 13-1 shows the typical curve of the internal resistance of NiMH charging function. Note the decrease in impedance after the battery has rested for a while. To obtain accurate results, allow the battery to rest after unloading and reloading. Laptop batteries can be repaired but such work has only economic sense for smaller operators. The success rate varies with the type of battery. One must remember that the 'smart' battery consists of two parts, chemical cells and digital circuit. In some cases, the chemical can be fully restored but the fuel gauge may become inaccurate or other data can get corrupted. Anyone who tries to repair the SMBus battery should be aware of a certain failure in the SBS forum. Unlike other tightly regulated standards, the SMBus protocol allows some variations. This can cause problems with existing chargers and the SMBus battery should be checked to see if there are compatibility before use. The need to test and approve the junction between a specific battery and charger is unfortunate, given the fact that the SMBus battery is being promoted as being universal. Ironically, adding more features to the SMBus charger and battery, the higher the likelihood of incompatibilities.