Flexible Battery Fabric Goes into Mass Production: Wearable Device Battery Life No Longer Constrained

LG Chem has begun mass production of a flexible lithium-polymer battery woven into fabric at its new Cheongju facility in South Korea. The battery textile delivers 450 Wh/L energy density while bending to a radius of 5mm without performance degradation. Each "battery thread" is 0.3mm in diameter and can be sewn, knitted, or laminated into garments.

The first commercial application arrives next quarter in Samsung's Galaxy Ring 2, which now offers 21 days of battery life — up from five days in the previous model. Sportswear brand Under Armour has also signed a deal to integrate the fabric into its next-generation fitness apparel line. LG Chem says annual production capacity will reach 10 million square meters by late 2028.