Yes, lead-acid batteries are still widely used in various applications despite the emergence of newer battery technologies like lithium-ion. Lead-acid batteries offer several advantages, such as reliability, cost-effectiveness, and robustness, which make them suitable for specific uses. Here are some common applications where lead-acid batteries are still prevalent:

1. Automotive Industry
Starter Batteries: Lead-acid batteries are commonly used as starter batteries in internal combustion engine vehicles (cars, trucks, motorcycles). They provide the high current needed to start the engine.
Electric Vehicles (EVs): Some electric vehicles use lead-acid batteries for auxiliary functions or as backup power sources.
2. Uninterruptible Power Supplies (UPS)
Lead-acid batteries are widely used in UPS systems to provide backup power during electrical outages for critical systems like data centers, hospitals, and telecommunications.
3. Renewable Energy Storage
Solar Power Systems: Lead-acid batteries are often used in off-grid solar power systems to store energy generated by solar panels.
Wind Power Systems: Similar to solar systems, they can be used to store energy generated by wind turbines.
4. Industrial Applications
Forklifts and Material Handling Equipment: Many forklifts and other material handling equipment use lead-acid batteries due to their ability to deliver high currents.
Mining Equipment: Used in various types of mining machinery for their robustness and reliability.
5. Marine Applications
Boats and Yachts: Used for starting engines and powering onboard electronics and lighting.
6. Telecommunications
Backup Power: Provide reliable backup power for telecommunication towers ensuring uninterrupted service.
Advantages of Lead-Acid Batteries
Cost-Effectiveness

Generally cheaper compared to newer technologies like lithium-ion, making them an economical choice for many applications.
Reliability and Robustness

Proven track record of reliability and robust performance under various conditions including extreme temperatures.
High Surge Current Capability

Ability to deliver high surge currents makes them ideal for applications requiring large bursts of power over short periods of time.
4 . ### Recyclability :
High recyclability rate reduces environmental impact compared some other battery types

Disadvantages of Lead-Acid Batteries
1 . ### Weight Size :
Heavier bulkier compared newer technologies limiting their use weight size critical factors

2 . ### Limited Cycle Life:
Shorter cycle life compared lithium ion reducing overall lifespan frequent deep discharges

3 . ### Maintenance Requirements:
Flooded lead acid batteries require regular maintenance checking electrolyte levels adding distilled water if necessary

4 . ### Lower Energy Density:
Lower energy density means they store less energy per unit weight volume compared modern alternatives

By leveraging these advantages along with understanding limitations; users can effectively utilize lead acid batteries suitable applications ensuring optimal performance longevity