How much lithium battery power to keep is worth the storage capacity? Nowadays, cell phones and laptops have become a necessity in people's lives. One of the most unbearable things in life is when the batteries of cell phones and laptops suddenly run out of power. More and more people are becoming worried about using the battery in an improper way and reducing its life. To maximize the performance of lithium batteries and extend their life, you need to master the correct charging method. But when the battery is not in use, how to store the lithium battery is worth the storage capacity?
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Lithium battery power to maintain at how much is good storage?
In fact, lithium batteries are not afraid of charging, but afraid of running out of power, how to say it? Many batteries have the so-called "charge management IC", so that the battery will not explode when charging over the safe voltage, but also because of the lack of power, resulting in low voltage can not start the charging process. Therefore, if the lithium battery is not charged, and after a long time not charged, it is likely that the battery will be disposed of early because of low voltage. If you do not use lithium batteries for a long time, it is best to retain 40% of the power.
Determine the capacity of the main source of several factors to consider.
1. lithium-ion battery itself self-discharge, if not charged will lead to over discharge of the battery, thus making the lithium ion chemical activation purity, reducing the return capacity
2. lithium-ion batteries if kept at 100% of the power shipped, will bring risks to the transportation process or storage process, because the state of full charge, lithium ions are the most active, while the security risks are also the largest
3. According to most of the battery factory's actual test data, with 50% of the power shipped, can ensure that it is stored for more than a year, the voltage is still above 3.2V, recovery capacity sub ah more than 98%.
Reduce the number of charges can extend the life of lithium batteries?
Now the lithium battery capacity loss, is calculated by charging "cycle number", according to Apple's official statement, this cycle number is calculated by the percentage of each battery discharge accumulated as a charging cycle, that is, the battery from 0 to 100 will only be counted as a charging cycle, if charged from 50% to full charge, which is considered half a charging cycle, and not a charge is a cycle, so that Do not need to have to wait until the battery is low before charging.
Li-ion battery has no memory effect, can be charged at any time, in order to reduce the number of charges and deliberately fill the battery after exhaustion, does not extend the battery life, but has a negative impact on the life of the battery.
In fact, lithium battery charging is about "eating less and eating more", frequent shallow charging and discharging will help extend its life.
The correct charging method for old lithium batteries
1、Charging method
Old battery is a battery that has been charged and discharged many times, rather than the end of the battery. The life of the lithium battery has nothing to do with the number of charge and discharge, it has no memory effect, no matter how you charge, will not affect the number of charging cycles. Therefore, do not use the battery to completely dead before charging, it is best when you can charge, try to charge the battery, charging time to 2-3 hours or less, of course, you do not have to be full
2、Charging voltage
The safe working voltage range of lithium batteries is 2.8 to 4.2V, below or above this voltage range, the lithium ions in the battery becomes very unstable, and even cause accidents. To ensure that the battery is in a safe range, so you need a special charger. These chargers will automatically adjust the charging method according to the current state of the battery.
3、Charging tools
Lithium battery charging to use a special charger, it can guarantee the safety of charging. When the charger works, it charges the battery with a constant current. As the battery voltage rises, the charger simultaneously increases the charging voltage to speed up the charging speed. When the battery reaches the 4.2V cutoff voltage, the battery is only about 70% charged (not full). At this point, the charger is a constant voltage, gradually become smaller current to continue charging the battery, when the value to less than 0.1A charging is still detected when the battery voltage continues to rise before stopping charging.
4、Regular charging
Long-term use of lithium batteries, should be stored in a cool and dry place in a half-charged state. Full charge storage is dangerous, and the battery will be damaged, and no power storage, the battery may be destroyed, thus losing its role. During storage, every 3 - 6 months, a charging cycle should be completed and a power calibration done.
In daily life, it may usually take several charges to complete a cycle. Each time a charge cycle is completed, the battery capacity decreases a little. However, this reduction in power is very small, and high-quality lithium batteries will still retain 80% of their original capacity after multiple cycles of charging, and many lithium-powered products are still used as usual after two or three years. Of course, the lithium battery life to the final after still need to be replaced.
Translated with www.DeepL.com/Translator (free version)
