The battery life of a mobile phone is about one and a half to two years, and the battery health will drop to about 80%, and 99% battery health means that the battery is still in a very good state with little capacity loss, so the battery with 99% battery health can continue to be used for some time.
Mobile phone batteries will burn in high temperature environment, which will not only affect the use experience, but also affect the battery life, and may even cause combustion or explosion in severe cases. In low temperature environment, the battery life will also be damaged.