A hole-filled battery could make wearables more breathable than cotton
A lithium battery patterned with holes is flexible, stretchable and allows more airflow than cotton, making it perfect for fitness tracking or medical monitoring wearables
![A hole-filled battery could make wearables more breathable than cotton](https://images.newscientist.com/wp-content/uploads/2025/01/24152839/SEI_2371817391.jpg)
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