Lithium-ion polymer batteries in smartphones have a certain service life, and batteries are also the most prone to wear and tear in mobile phones. Half of the life of a lithium battery is calculated according to the number of charge and discharge cycles, and it is a complete cycle from 0 to 100% and then to 0. If you charge your phone every time you use up half of its power, it counts as a half cycle.
Therefore, if you use it lightly, you can charge the mobile phone every day when you use 50% of the power, and you can let the lithium battery go through a charge-discharge cycle in about 2 days.
According to the industry standard of lithium batteries, the cycle life of smartphone lithium batteries must be at least 500 times, and better batteries can have 700 times. Taking an average of 600 cycles and charging with 50% of the electricity every day, it can be used for about 1200 days. That is about 3 years.
Of course, the number of cycles of a lithium battery does not mean that the battery will be scrapped immediately and cannot be used. Generally, after hundreds of charge and discharge cycles, the battery life will drop significantly. The battery life of the mobile phone is only about 60% of the new state, that is, it may need to be charged in less than half a day. And as the frequency of charging and discharging accelerates, the life of the battery will be further shortened significantly.
Therefore, the lithium battery of the mobile phone needs to be replaced within 3 years at most. If the requirements for battery life are relatively high, or it is under heavy use, then this time may be even shorter.
Generally speaking, if you feel that the battery of your mobile phone is obviously not enough, and you can’t last for a single charge or even a day, then it’s time to replace the battery. At present, the cost of battery replacement for domestic mobile phones is relatively low, and it can be replaced for about 100 yuan, so the cost of replacing the battery every two years is not very high.
The battery cost of Apple mobile phones is relatively high. It costs more than 300 yuan to replace a battery in a mobile phone before iPhone X, and more than 500 yuan to replace a battery in iPhone X and later mobile phones. Moreover, the lithium battery capacity of Apple mobile phones is relatively small, the charging frequency is relatively frequent, and the life span is shorter than that of large-capacity domestic mobile phone batteries.