The decrease in battery capacity is due to an increase in internal resistance due to oxidation (this is the main cause of battery capacity degradation). Finally, the cell resistance will reach a certain point, although the battery is fully charged, the battery will not release the stored charge.
The aging speed of a lithium battery is determined by temperature and state of charge. The table below shows the reduction in battery capacity for both parameters.
Temperature charging 40% (recommended) Charging 100%
0°c 98% 94% after one year One year later
25°c 96% 80% after one year One year later
40°c 85% 65% after one year One year later
60°c 75% 60% after one year Three months later
It can be seen that the high state of charge and the increased temperature accelerate the decrease in battery capacity. If possible, try to charge the battery to 40% in a cool place. This allows the battery's own protection circuit to operate for a long period of time. If the battery is placed at a high temperature after being fully charged, it will cause great damage to the battery. (So ​​when we use a fixed power supply, the battery is fully charged at this time, the temperature is usually between 25-30 °c, which will damage the battery, causing its capacity to drop).
Some batteries will also be scrapped due to excessively low discharge. If placed below 2.5 volts per unit, the safety circuit inside the battery will start, and the battery will be somewhat useless. However, if the battery drops below 1.5 volts per unit and remains in that state for some time, for safety reasons, do not charge the battery. To avoid this type of situation, do not store a fully discharged battery. Some electricity should be charged before storage and fully charged before use.
In summary, avoid full discharge during the use of lithium batteries, often charging lithium batteries. Repeated random charging will not damage the battery. Place the lithium battery in a cool place without freezing. Avoid placing it in a car at high temperatures. If it is stored for a long time, put the battery to 40% and place it. If you are using a fixed power supply most of the time, remove the battery and put it in a cool place.
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