What type of battery is commonly used in alarm systems?

The commonly used battery in alarm systems is the rechargeable lead-acid battery. This type of battery is favored in alarm applications due to its advantages in providing reliable power for extended periods, especially during power outages. Lead-acid batteries are designed for deep cycling, which means they can be discharged and recharged multiple times without significantly impacting their overall lifespan. This is crucial for alarm systems, which may need to function continuously even when the main power source is disrupted.

Additionally, lead-acid batteries are cost-effective and widely available, making them a practical choice for both residential and commercial alarm systems. They also have a proven track record of performance under varied temperatures and conditions, contributing to the robustness needed for security applications.

While other battery types, such as Nickel-Cadmium and Lithium Polymer, might be used in specific applications, their characteristics do not align as perfectly with the demands of typical alarm systems as those of rechargeable lead-acid batteries. Alkaline batteries, while common in many devices, do not support the recharging capability required for systems that need to maintain functionality over time.