A lead-acid battery (VRLA) is a battery whose electrodes are mainly made of lead and its oxides and whose electrolyte is a sulfuric acid solution. In the discharged state of the lead-acid battery, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in the charged state, the main components of the positive and negative electrodes are lead sulfate.

The nominal voltage of a single-cell lead-acid battery is 2.0V, which can be discharged to 1.5V and can be charged to 2.4V; in applications, 6 single-cell lead-acid batteries are often used in series to form a nominal 12V lead-acid battery , There are 24V, 36V, 48V and so on.

French Plante invented lead-acid batteries in 1859 and has experienced nearly 150 years of development. Lead-acid batteries have made great progress in the theoretical research, product types and varieties, and product electrical performance. Lead-acid batteries have played an indispensable and important role in various economic fields such as transportation, communications, electricity, military and nautical and aviation.
According to the difference between the structure and use of lead-acid batteries, batteries are roughly divided into four categories:
1. Lead-acid battery for starting;
2. Lead-acid battery for power;
3. Fixed valve-controlled sealed lead-acid battery;
4. Other categories, including small valve-regulated sealed lead-acid batteries, lead-acid batteries for miner's lamps, etc.

A single lead-acid battery has a nominal voltage of 2.0V, can be discharged to 1.5V, and can be charged to 2.4V. In application, 6 single-cell lead-acid batteries are often used in series to form a nominal 12V lead-acid battery. There are also 24V, 36V, 48V, etc.

Main features
Safety seal
During normal operation, electrolyte will not leak out of the battery terminals or casing. No free acid

The special liquid-absorbing separator keeps the acid inside. There is no free acid inside the battery, so the battery can be placed in any position.

Vent system
When the internal pressure of the battery exceeds the normal level, the VRLA battery will release excess gas and automatically reseal it to ensure that there is no excess gas in the battery.

Simple maintenance
Since the gas recombination system converts the generated gas into water, no water needs to be added during the use of VRLA batteries.

long lasting
The VRLA battery with lead-calcium alloy railing with anti-corrosion structure can be float-charged for 10-15 years.

Stable quality and high reliability
Using advanced production technology and strict quality control system, VRLA battery has stable quality and reliable performance. 100% inspection of voltage, capacity and sealing on the line.

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