Valve-Regulated Lead-Acid (VRLA) batteries are a type of rechargeable battery commonly used for uninterruptible power supply (UPS) systems, telecommunications equipment, and emergency lighting. VRLA batteries are sealed and maintenance-free, designed with pressure-relief valves to prevent the buildup of excess gas. They use a gel or absorbent glass mat (AGM) electrolyte that immobilizes the electrolyte, eliminating the need for regular watering and making them leak-resistant. VRLA batteries offer a dependable and cost-effective power source, with advantages including a long service life, reduced maintenance requirements, and a compact design, making them suitable for a variety of applications where reliable standby power is essential.