Cold weather significantly impacts smartphone battery performance, causing them to drain faster and shut down unexpectedly. This phenomenon is not a fault but a result of the battery's internal temperature dropping. Factors like high screen brightness, continuous GPS use, and video recording in cold conditions exacerbate the issue. Using thick, insulating phone cases can help mitigate heat loss, while thin metal cases may worsen it. Simple habits like reducing brightness and closing unused apps can help manage battery performance in colder temperatures.