iFixit released a video showing the manufacturing and testing of lithium‑polymer battery cells inside a Chinese factory, offering a view of how iPhone batteries are produced before assembly. The footage captures the assembly line where cells are formed, sealed and inspected, with quality‑control checks performed on each unit. Close‑up shots show the polymer material being wound, the cell casing being sealed, and automated testing equipment verifying voltage and capacity. iFixit noted that the cells are produced by a supplier that manufactures batteries for multiple smartphone brands, without naming the specific facility. The video contains no commentary on the cells' performance or safety. The release provides consumers and repair professionals with information about battery composition and production methods, though the impact on repairability remains uncertain.