In this case, after the lithium battery is fully charged, the protection power is cut off, so the voltage of the lithium battery will drop to a certain extent when it falls back to the set value, it will be charged again. .
This situation is more likely to occur, especially when the charging current is relatively large, and some may occur more than once.
Of course, if your charging current is not large or you have constant voltage charging function, for example, if the cut-off charging current can reach 0.02C , this will happen anyway, so you need to consider the battery itself. Is the pressure drop too great? In this case, its K value must be unqualified and the supplier can select it at the factory.
How to clear battery count on MacBook Pro? How to Check MacBook Battery Cycle Number/p>
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Updated 08/30/2019 | 4869 people viewed
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Battery Forever Performance will decrease. If the number of cycles is too high, you should consider replacing it. MacBook is better than other computers because it has statistics built into the system, which can be easily checked.
Macbook Tools and Raw Materials
Method/ Read step by step< /p>
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Open Finder and click the application to enter the application list, then click Utilities and double-click to open< /p>
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Find system information in the utility tool and double-click to open it
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Click on the power option and look for the cycle count, which is the number of cycles the battery has if the battery has too many. many cycles and exceeds 500 times, you may consider replacing a battery. The units ofBattery capacity includes mAh, Ampere-hour Ah and kWh. In the battery capacity calculation formula, C is often used to represent the battery capacity, which represents the capacity of all types of units. The method of converting battery capacity units is a problem we often encounter. How to do it specifically?
Common battery capacities over their lifetime are measured in mAh and Ah, including dry batteries, nickel metal hydride batteries, lithium batteries and small lead-acid batteries, which are mainly used in some 3Cs. The product is installed on small household appliances or lighting.
To quickly estimate the capacity of polymer batteries, the commonly used estimation formula (used only for estimation):
Capacity = thickness * width * length * K (l 'unit K is mah/mm3)
The plage of K value is (0.07 ~ 0.11). The K value depends on the size of the capacitance. The larger the capacity, the smaller the K value. the K value (which can be understood as the larger the size, the larger the K value).
In the actual calculation, the K value can be set to 0.1 by default. For example, 103450LP (thickness 10mm, width 34mm, length 50mm), calculated capacity = 10*34*50*0.1=1700, actual capacity is more than 1800mah, for example 603048;LP (thickness 6 mm, width 30mm, length 48mm), calculated capacity = 6*30*48*0.1=864, actual capacity can reach 900mah.
Analysis of the correspondence between the open circuit voltage of the lithium-ion battery and the battery capacity
First give a table: as follows, the percentage is the remaining battery capacity, and the right side is the corresponding battery open circuit voltage (OCV).