language

About Us

Home

News and Information

What type of battery is a lead-acid battery?

Release time:

2026-05-08 09:41

Lead–acid batteries are highly mature and widely used secondary (rechargeable) batteries. Their electrodes are primarily made of lead and its oxides, while the electrolyte is a sulfuric acid solution. In essence, these batteries convert electrical energy into chemical energy and vice versa through chemical reactions between the internal lead plates and the sulfuric acid, thereby enabling energy storage and delivery.

To provide you with a comprehensive understanding of lead-acid batteries, the following outlines their core characteristics, common classifications, and primary applications:

Core advantages and disadvantages:
In terms of advantages, it boasts extremely low costs—among currently prevalent battery technologies, it has the lowest initial purchase price; its technology is mature and reliable, having been in use for over 160 years with stable performance and high safety; it delivers strong high-current discharge capability, able to supply substantial current in a short time, making it ideally suited for engine starting; and it features a high recycling rate, with lead-acid batteries achieving an exceptionally high recovery and reuse rate of up to 99%, as lead, plastic, and electrolyte can all be recycled.
On the downside, lead-acid batteries have low energy density, making them heavier and bulkier than lithium-ion batteries; their cycle life is relatively short, with a limited number of charge–discharge cycles, resulting in a shorter service life overall; and there are environmental concerns, as they contain the heavy metal lead and corrosive sulfuric acid, which can easily lead to environmental pollution if not properly disposed of.

Common classifications:
Lead-acid batteries can be classified in various ways; the most common classifications encountered in everyday life are as follows:
Based on maintenance requirements, conventional flooded batteries are the traditional lead–acid type, with a liquid electrolyte that requires regular inspection and topping up with distilled water, making them relatively high-maintenance. Maintenance-free batteries (VRLA or sealed batteries) are now the mainstream; their unique internal design results in minimal electrolyte consumption, so they essentially require no water top-ups throughout their service life. These batteries are mainly divided into two types: AGM batteries, in which the electrolyte is absorbed into a glass-fiber separator, offering fast charging and excellent vibration resistance—making them commonly used in vehicles equipped with “start–stop” systems—and gel batteries, in which the electrolyte is in a gel state, providing superior leak-proof performance as well as enhanced resistance to deep discharge and extreme temperatures.
By application: starter batteries are specifically designed for the instantaneous starting of internal combustion engines in automobiles, motorcycles, and other vehicles, delivering high surge current; traction/deep-cycle batteries are used in electric vehicles, forklifts, golf carts, and similar applications, supporting prolonged deep-discharge cycles; stationary/energy-storage batteries are employed in communication base stations, UPS systems, solar energy storage systems, and other applications, providing a stable backup power supply.

Main application scenarios:
Lead-acid batteries are ubiquitous in our daily lives. In the transportation sector, they serve as the starting, lighting, and ignition power source for the vast majority of internal-combustion vehicles; in backup power applications, they are commonly used in UPS emergency power systems for hospitals, banks, and data centers; in power-drive applications, they power electric bicycles (in some cases), electric forklifts, sightseeing vehicles, and more; and in energy-storage systems, they function as storage units for renewable-energy generation systems such as solar and wind power.

Although lithium-ion batteries have gained a competitive edge in recent years in terms of energy density and cycle life, lead-acid batteries remain an irreplaceable choice in many applications thanks to their exceptionally high cost-effectiveness and superior safety.

None