1. Introduction With the continuous progress of science and technology and increased awareness of environmental protection, lithium batteries, as an environmentally friendly and efficient energy storage solution, are gradually replacing traditional lead-acid batteries as the industry's first choice. In this paper, we will discuss the prospects and advantages of lithium batteries instead of lead-acid batteries.   2. Introduction to lithium batteries Lithium battery is a kind of battery that utilizes lithium ions to migrate back and forth between the positive and negative electrodes. Compared with lead-acid batteries, lithium batteries have higher energy density, longer service life and lower self-discharge rate.     3. Advantages of lithium batteries 3.1 High energy density Lithium batteries have higher energy density, can store more energy, and provide longer use time in the same volume. This makes lithium batteries widely used in mobile devices and electric vehicles.   3.2 Long Life Lithium batteries typically have a longer lifespan than lead-acid batteries. They are able to withstand more charge/discharge cycles without loss of performance, thus reducing the need for more frequent battery replacement.   3.3 Lower self-discharge rate In contrast, lead-acid batteries have a high self-discharge rate and gradually lose energy even when not in use. Lithium batteries, on the other hand, have a relatively low self-discharge rate and are able to maintain storage for a longer period of time, making them suitable for long-term standby power application environments.   3.4 Environmentally friendly and recyclable Compared with lead-acid batteries, lithium batteries do not contain heavy metals and are more friendly to the environment. At the same time, the main components of lithium batteries (such as lithium, nickel, cobalt, etc.) have the value of recycling, which can realize the reuse of resources.   4. Application of lithium battery in various fields 4.1 Mobile devices Lithium batteries are widely used in mobile devices such as smart phones and tablet PCs. Their high energy density and long service life enable users to use portable devices for a longer period of time without frequent charging.   4.2 Electric Vehicles Li-ion batteries have become the preferred energy storage solution for electric vehicles. Their high energy density and fast charging capability enable electric vehicles to have longer range and shorter charging time.   4.3 New Energy Storage Systems With the popularization of renewable energy generation technologies, lithium batteries, as the core of new energy storage systems, are able to store electrical energy for use by manufacturers and users at times of peak demand, further improving energy utilization efficiency.   5. Conclusion As an environmentally friendly and efficient energy storage solution, Li-ion batteries have the advantages of high energy density, long life, low self-discharge rate and recyclability. It has a broad application prospect in the fields of mobile devices, electric vehicles and new energy storage systems. Therefore, the trend of lithium batteries replacing lead-acid batteries will become more and more obvious. https://youtu.be/eOZYnsn4REQ?si=7EVdjIN_QtumhRNP