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Battery pack refers to a set of multiple batteries assembled together to function as a single unit, providing electrical energy for various devices. These packs are commonly used in portable electronic devices, electric vehicles, and renewable energy systems. A battery pack typically consists of multiple cells connected in series, parallel, or a combination of both, to achieve the desired voltage and capacity. Battery packs can vary in size, shape, and chemistry, with common types including lithium-ion, nickel-metal hydride, and lead-acid. They are designed to be rechargeable or non-rechargeable, depending on the application. Their performance is influenced by factors such as capacity (measured in amp-hours), discharge rates, and overall lifespan. Battery packs are crucial for powering modern technology, enabling mobility and energy storage solutions.