Lithium ion polymer batteries used for smartphones have a certain service life and are the most easily worn batteries in mobile phones. The half-life of lithium batteries is calculated based on the number of charging and discharging cycles. Charging is a complete cycle, from 0 to 100%, and then back to 0. If you charge your phone halfway every time, it will take half a cycle.

Therefore, if the usage is not large, it is possible to charge the phone with 50% of the battery every day, and the lithium battery can complete the charging and discharging cycle in about 2 days.

According to the industry standard for lithium batteries, the cycle life of lithium batteries is at least 500 times, while better batteries can reach 700 times. On average, 600 cycles are conducted per day, and then charged at 50% of the battery every day, which can last for approximately 1200 days or 3 years.

Of course, the number of cycles of a lithium battery does not necessarily mean that the battery is immediately discarded and unusable. Usually, after hundreds of charging and discharging cycles, the battery life will be greatly shortened. The battery life of the battery is only 60% of its new state, which means it may take less than half a day to complete charging. And with the acceleration of charging and discharging frequency, the battery life will be greatly shortened.

Therefore, the lithium battery of mobile phones needs to be replaced for up to 3 years. If the battery life is relatively long or overused, this time may be shortened.

Generally speaking, it feels like the battery of a phone is noticeably low and cannot be used consistently for a single charge or even a day, so it's time to replace the battery. At present, the cost of replacing the battery of domestic mobile phones is very low, about 100 yuan, so the cost of replacing the battery every two years is not high. Moreover, the cost of Apple phone batteries is relatively high, Replacing a battery for iPhone X and beyond costs over 300 yuan, Replacing a battery on iPhone X and later costs over 500 yuan. And the lithium battery capacity of Apple phones is relatively small, the charging frequency is relatively frequent, and the lifespan is shorter than that of large capacity household phone batteries.

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