Custom-made YJ502030 lithium polymer battery, precisely engineered for smartwatches with a compact 502030 size (5.0mm thickness x 20mm width x 30mm length). Features high-density 250mAh capacity and stable 3.7V output for extended wearable device performance.

Premium polymer electrolyte ensures superior thermal stability and enhanced cycle life (500+ charges). Ultra-thin PVC laminated casing provides puncture resistance while maintaining flexibility for curved wearable applications.

Ideal replacement battery for major smartwatch brands, supporting continuous heart-rate monitoring and Bluetooth connectivity. Includes built-in PCB protection against overcharge/over-discharge.

Exclusive wholesale pricing for bulk orders with MOQ flexibility. Direct factory sourcing guarantees authentic cells with ISO-certified manufacturing. Global shipping with competitive lead times.

(Note: Battery capacity may vary slightly due to different testing methods; actual smartwatch runtime depends on device power management.)