The lithium-manganese pouch battery is comprehensively optimized for space-constrained environments. Utilizing an ultra-thin laminated structure and a customized form factor, it perfectly adapts to the internal space constraints of wearable devices. Unlike traditional metal-cased batteries, the lithium-manganese pouch battery uses flexible packaging materials, such as aluminum-plastic film, instead of a rigid metal casing, significantly improving its adaptability. These innovations allow the battery to adjust its shape according to the internal space of the device, maximizing the use of every millimeter of space. This miniaturization technology frees up valuable space within wearable devices.