Lithium-ion (Li-ion) batteries are rechargeable batteries that use lithium ions as the primary material for the electrolyte. Commonly used in portable electronics, electric vehicles, and renewable energy systems due to their high energy density, low self-discharge rate, and long cycle life. Lithium-ion batteries offer better performance, low maintenance and energy efficiency.

Lead-acid batteries are one of the oldest and most widely used rechargeable batteries. Lead is used as the primary material for anode and cathode with sulfuric acid electrolyte. Commonly used in automotive and backup power applications due to the low cost, high surge current capability and ease of maintenance. However, it has a relatively low energy density and is sensitive to temperature changes, requiring regular maintenance to ensure long-term reliability.