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What is the best storage capacity for lithium batteries to maintain? Nowadays, mobile phones and laptops have become essential items in people's lives. One of the most unbearable things in life is when the battery of a phone or laptop suddenly runs out of battery. More and more people are starting to worry about using batteries improperly and reducing their lifespan. To maximize the efficiency of lithium batteries and extend their lifespan, it is necessary to master the correct charging method. But when the battery is not in use, how to store lithium batteries that are worth storing capacity?

What is the best storage level for lithium batteries?

In fact, lithium batteries are not afraid of charging, but are afraid of running out of battery. How can we say that? Many batteries have so-called "charging management ICs", which prevent the battery from exploding due to exceeding the safe voltage during charging, and also prevent the battery from being unable to start the charging program due to low voltage caused by running out of battery. Therefore, if a lithium battery runs out of battery and is left uncharged for a long time, it is likely to be scrapped early due to low voltage. If lithium batteries are not used for a long time, it is best to retain 40% of the battery capacity.

The main factors that determine this capacity are:

1. Lithium ion batteries themselves self discharge, and if not charged, it can cause the battery to over discharge, thereby chemically activating the purity of lithium ions and reducing the recovery capacity

2. If lithium-ion batteries are shipped at 100% charge, it will pose risks during transportation or storage, as lithium-ion batteries are the most active when fully charged, and safety hazards are also the greatest

According to the measured data of most battery factories, shipping with 50% of the battery capacity can ensure that it has been stored for more than a year, the voltage is still above 3.2V, and the recovery capacity is over 98%.

Can Reducing Charging Times Extend the Life of Lithium Batteries?

The current capacity loss of lithium batteries is calculated based on the number of charging cycles. According to Apple's official statement, the calculation of this cycle is based on the cumulative percentage of each battery discharge as a charging cycle. That is to say, the battery will only be counted as a charging cycle from 0 to 100. If it is charged from 50% to full, it is considered as half a charging cycle. It is not a charging cycle, so there is no need to wait until the battery level is low before charging.

Lithium batteries have no memory effect and can be charged at any time. Deliberately using up and recharging the battery to reduce the number of charges does not prolong its lifespan, but rather has a negative impact on its lifespan.

In fact, lithium battery charging emphasizes "eating less and eating more", and frequent shallow charging and discharging is more helpful in extending its lifespan.

Correct charging method for old lithium batteries

1. Charging method

Old batteries refer to batteries that have been charged and discharged multiple times, rather than discarded batteries. The lifespan of a lithium battery is independent of the number of charging and discharging cycles. It has no memory effect, and no matter how you charge it, it will not affect the number of charging cycles. Therefore, do not charge the battery until it is completely dead. It is best to try to fully charge the battery when you can, and the charging time should be within 2-3 hours. Of course, you do not necessarily have to fully charge it

2. Charging voltage

The safe working voltage range of lithium batteries is 2.8 to 4.2V. If it is lower or higher than this voltage range, the lithium ions in the battery become very unstable, and even cause accidents. To ensure that the battery is within a safe range, a dedicated charger is required. These chargers will automatically adjust the charging method based on the current state of the battery.

3. Charging tools

Lithium battery charging requires the use of a dedicated charger, which can ensure the safety of charging. When the charger is working, it charges the battery with a constant current. As the battery voltage increases, the charger also increases the charging voltage to accelerate the charging speed. When the battery reaches the cut-off voltage of 4.2V, it only charges about 70% of its capacity (not fully charged). At this point, the charger continues to charge the battery with a constant voltage and gradually decreasing current. When the value reaches less than 0.1A and the battery voltage continues to rise, it stops charging.

4. Regular charging

Lithium batteries that are not used for a long time should be stored in a semi charged state in a cool and dry place. Full charge storage is dangerous and the battery may be damaged, while without charge storage, the battery may be damaged and lose its function. During storage, a charging cycle should be completed every 3-6 months to perform a battery calibration.

In daily life, it may take several charges to complete a cycle. Every time a charging cycle is completed, the battery capacity will decrease slightly. However, the reduction in battery capacity is very small. After multiple cycles of charging, high-quality lithium batteries still retain 80% of their original capacity. Many lithium-ion powered products are still used as usual after two or three years. Of course, lithium batteries still need to be replaced at the end of their lifespan.

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