When talking about wearable devices or implantable medical devices, we must pay special attention to the device's battery problems. Ideally, the battery needs flexible and long-lasting functions, while it can bend or twist and they will be harmless chemicals. So far, batteries developed for these uses do not conform to safety materials but are packaged to keep chemicals from leaking and coming into contact with human tissues. However, this often makes them clunky and rigid. However, a research team has developed a new flexible battery that does not require hazardous chemicals. They can run through body fluids, such as power in the coming sweat and tears.
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Instead of fillers, sodium-based chemicals such as saline and solutions for cell culture are used. Although it is still not the best of these solutions, if they do, it will not bring the same risk of other battery chemical reactions. Due to excessive leakage prevention measures, the added material is not necessary and the battery can easily maintain its elasticity. These batteries can operate in body fluids such as sweat in the future. 
