Credit: Robert Triggs / Android AuthorityTL;DRA new behind-the-scenes video by iFixit explores a factory floor in China that produces nearly 13 million smartphone battery cells every month.The video reveals that raw cells require dedicated circuit boards flashed with custom software to prevent dangerous overcharging.Before shipping, each battery is tested by diagnostic equipment to verify its capacity, safety thresholds, and 100% health.Ever wondered what actually goes into making the batteries for your smartphone? A new behind-the-scenes video by iFixit pulls back the curtain on how its iPhone replacement batteries are really made, taking us straight to the factory floor in Weao, China, where nearly 13 million smartphone battery cells are produced every single month.While a smartphone battery might look like a simple pack of solid chemicals from the outside, turning a raw lithium-polymer cell into a fully functional, device-ready component requires meticulous precision engineering, software programming, and strict quality control.