How long can lithium batteries generally last?

How long can lithium batteries generally last?

The lifespan of lithium batteries is generally 300-500 charging cycles. Assuming that the amount of electricity provided by a complete discharge is Q, without considering the decrease in electricity after each charging cycle, lithium batteries can provide or supplement a total of 300Q-500Q of electricity during their lifespan. From this, we know that if we charge with 1/2 each time, we can charge 600-1000 times; If it is charged every 1/3, it can be charged 900 to 1500 times. Similarly, if charged randomly, the number of times is not fixed. In short, no matter how it is charged, the total amount of electricity replenished is between 300Q and 500Q, which is constant. So, we can also understand it this way: the lifespan of lithium batteries is related to the total charging capacity of the battery, and not to the number of charging times. The impact of deep discharge and shallow charge on the lifespan of lithium batteries is not significantly different.

In fact, shallow discharge and shallow charge are more beneficial for lithium batteries, and deep discharge and deep charge are only necessary when the power module of the product is calibrated for lithium batteries. So, products powered by lithium batteries do not have to be limited by the process, everything is convenient first, can be charged at any time, and there is no need to worry about affecting their lifespan.

If lithium batteries are used in environments above the specified operating temperature of 35 ° C, the battery's charge will continuously decrease, meaning that the battery's power supply time will not be as long as usual. If the device needs to be charged at such a temperature, the damage to the battery will be even greater. Even storing batteries in hot environments will inevitably cause corresponding damage to the quality of the batteries. So, maintaining a suitable operating temperature as much as possible is a good way to extend the lifespan of lithium batteries.

If lithium batteries are used in low temperature environments, i.e. below 4 ° C, it will also be found that the battery life is reduced, and some phones' original lithium batteries cannot even be charged in low temperature environments. But don't worry too much, this is just a temporary situation. Unlike use in high-temperature environments, once the temperature rises, the molecules in the battery are heated and immediately return to their previous level of charge.

To maximize the efficiency of lithium-ion batteries, it is necessary to use them frequently to keep the electrons inside the battery in a flowing state. If you don't use lithium batteries frequently, please remember to complete a charging cycle and perform a power calibration once a month, that is, deep discharge and deep charge once.

The formal term is "charge discharge cycle", which does not equal "number of charges". A cycle refers to the process of a battery running from full charge to depletion, which is one cycle. If your battery uses one tenth of its capacity from full charge and then fully charges again, it is one tenth of a cycle. Charging it 10 times in this way is considered one cycle. Similarly, starting from fully charged, using half and then fully charged, and then using half and then fully charged again, this is also a cycle, at which point you have charged twice. So, the cycle only depends on how much electricity is accumulated from the battery, and is not directly related to the number of charging times.

Moreover, the nominal number of charge and discharge cycles does not mean that it cannot be used after being used up, but rather that after so many cycles, the battery's ability to store electricity will decrease to a certain extent,

For example, a certain lithium battery has a nominal charge discharge cycle of "not less than 60% of the nominal capacity after 500 cycles". This battery can only store up to 60% of the amount of electricity when a new battery is used.