The battery of mobile phones can be basically divided into three stages: nickel cadmium battery, nickel hydrogen battery, and lithium battery

　　From the names of these three stages, we can see that the chemical elements mainly used in batteries are changing, and there are more technological innovations in batteries. We can even say that without lithium batteries, there would be no mobile intelligent life today.

　　In the early 1980s, mobile phones were also known as "big brothers". From the name, it can be seen that they were very large, mainly because the battery was very large. Later on, for a period of time, whoever had a smaller phone could seize more market share.

　　In the early 1990s, lithium batteries were also introduced. In 1992, Sony's self-developed lithium batteries were put into use in their own products, but due to their high price and lack of any outstanding advantages in battery capacity, they were only used in their own products. With the technological innovation and manufacturing progress of lithium battery materials, their capacity and cost have improved, gradually gaining more favor from manufacturers, and the era of lithium batteries has officially arrived.