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A Lead Sealed Maintenance-Free (SMF) Battery is a type of lead-acid battery designed to require little to no maintenance during its lifespan. Unlike traditional lead-acid batteries, which need regular topping up of the electrolyte, SMF batteries are sealed and have a special valve-regulated design that allows gases to recombine and prevent electrolyte loss. This makes them more convenient and reliable, particularly in applications where regular maintenance is impractical. SMF batteries are commonly used in a variety of applications, including uninterruptible power supplies (UPS), solar power systems, electric vehicles, and telecommunications. They offer advantages such as better safety, longer service life, and improved performance in terms of charge retention and discharge efficiency compared to conventional lead-acid batteries. While they are maintenance-free, it is still important to properly manage charging to ensure longevity and optimal performance.