Chinese battery maker Grepow has published a technical whitepaper detailing its patented E-stacking curved-cell technology for smart rings.

Designed to overcome the core limitations of compact wearables, the approach is said to deliver up to 30% higher capacity in the same volume while improving reliability and comfort.

As the smart ring segment projects to soar in value by 2030, battery life and form factor have become critical roadblocks. Smart rings require powerful energy opions in compact, curved designs. Traditional battery manufacturing, which involves winding flat cells into an arc, creates mechanical stress, wastes internal space and can lead to inconsistent long-term performance.

Grepow’s whitepaper introduces its patented E-stacking process, which enables curved cells to deliver up to 21mAh of capacity – compared with 16mAh in conventional cells of the same size – and to sustain more than 500 stable cycles, extending device lifespan.

In a separate patent, the curved dual-tab battery design provides flexibility in industrial design, enabling cells as narrow as 4.1mm (typically 6mm) and supporting slimmer, more adaptable power configurations for compact wearables. Each cell undergoes 100% X-ray and CCD inspection to ensure safety and reliability, while silicon-carbon anode formulations further increase capacity and improve volumetric energy density by 17.2%.

By removing long-standing constraints in small-form-factor battery design, Grepow’s patented technology should enable thinner, lighter and longer-lasting smart rings, paving the way for seamless round-the-clock health monitoring, gesture control and biometric sensing in everyday wear.

The full whitepaper is available for download at www.grepow.com/storage/images/20251015/0b13cb1e073f7079860f3fc1cdcf9962.pdf. For product information go to www.grepow.com/wearables/smart-ring.html.

Founded in 1998, Grepow (www.grepow.com) is a technology-driven manufacturer specialising in customised power. With R&D and automated manufacturing, Grepow delivers high-energy-density, shaped batteries for wearables, drones and other smart devices.