1. To prevent excessive discharge of the mobile phone's lithium-ion battery, try not to use the phone when the battery level is below 20%, and especially not below 5%, as this will cause irreversible damage to the battery.
2. The ideal state for a lithium-ion battery is when it has 40% charge remaining. Do not keep the battery at 100% charge for extended periods, as this can affect the battery's lifespan to some extent.
3. Avoid using the phone at high or extremely low temperatures. Charging at high or low temperatures can cause significant damage to the phone's lithium-ion battery. High temperatures may cause the battery to explode, while low temperatures will also greatly affect the battery's lifespan.
4. Prevent the phone battery from being completely dead for a long time. If the battery is left dead for an extended period, the phone may never be able to turn on again.
5. Use the original phone charger, check the lifespan and shelf life of the lithium-ion battery, and replace the battery in time. It is best to turn off the phone or not use it while charging, as this is good for the battery and can also help it charge faster.
It's important to note that lithium-ion batteries enter a dormant state after being stored for a period of time, at which point their capacity is lower than normal, and their usage time is shortened. However, lithium-ion batteries are easily activated; they can be activated and restored to normal capacity after just 35 normal charge-discharge cycles. Due to the inherent characteristics of lithium-ion batteries, they have virtually no memory effect. Therefore, no special methods or equipment are needed to activate a new lithium-ion battery in a user's mobile phone. The best approach is to use the standard charging method from the beginning for natural activation.
Regarding the activation of lithium-ion batteries, many people believe that charging time must exceed 12 hours, repeated three times, to activate the battery. This claim of charging for more than 12 hours for the first three times is clearly a continuation of the practice with nickel batteries (such as nickel-cadmium and nickel-metal hydride). Therefore, this claim is fundamentally a misconception. Lithium-ion batteries and nickel batteries have very different charging and discharging characteristics. Furthermore, I can clearly state that all the serious, official technical documents I have consulted emphasize that overcharging and over-discharging can cause significant damage to lithium-ion batteries, especially liquid lithium-ion batteries. Therefore, it is best to charge according to the standard time and method, and especially avoid charging for more than 12 hours. Usually, the charging method described in the phone's instruction manual is the standard charging method suitable for that phone.
Furthermore, lithium-ion battery phones or chargers automatically stop charging once the battery is fully charged; there is no trickle charging for over 10 hours as claimed by nickel-cadmium chargers. In other words, leaving your lithium-ion battery on the charger after it's fully charged is pointless. And since no one can guarantee that the battery's charge/discharge protection circuitry will never change or that its quality will be flawless, your battery will be constantly teetering on the edge of danger. This is another reason against prolonged charging.
Furthermore, on some mobile phones, if the charger is not removed after a certain charging time, the system will not only not stop charging, but will also begin a discharge-charge cycle. Perhaps the manufacturers have their reasons for this practice, but it is clearly detrimental to the lifespan of the battery and the phone/charger. Also, long charging times often occur overnight, and given the state of my country's power grid, voltage is often higher and fluctuates more significantly at night in many areas. As mentioned earlier, lithium-ion batteries are very delicate.
