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A mobile battery is a rechargeable battery that provides power to a mobile device, such as a smartphone, tablet, or portable music player. These batteries are typically lithium-ion or lithium-polymer, and are designed to be small, lightweight, and powerful enough to provide several hours of usage on a single charge. Some newer smartphones now have larger batteries and support fast charging technology which can charge battery to up to 50% in 15-20 minutes. Mobile batteries are typically built into the device and are not user-replaceable, but can be replaced by a professional.