Forget lithium – this Barcelona-based company is creating batteries with paper. Fuelium is developing paper-based batteries designed for disposable diagnostic devices, OZY reported. Unlike regular batteries, Fuelim’s batteries don’t create toxic waste that requires complicated recycling processes. What’s not to love?

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Paper, carbon, and non-toxic metals: those are the ingredients for Fuelium’s batteries. These won’t be powering cars right now; the company says their paper-based batteries are suited for powering in-vitro diagnostics (IVD) applications, or tests that can detect diseases with blood or tissue samples. Fuelium says their batteries are geared for “single-use electronic devices which can be disposed of without recycling.” Regular single-use diagnostic tests are thrown out after utilizing under one percent of their batteries’ charge, according to OZY. But Fuelium’s paper batteries, according to the Autonomous University of Barcelona’s Research Park, “only generate the amount of energy needed for each application and do not contain heavy metals or are harmful to health.”

Related: This revolutionary new paper battery is powered by bacteria

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Fuelium’s batteries can be customized for different applications with voltages between one and six volts, and power between one and 100 milliwatts. They’re cost-effective and can be easily integrated as the battery materials are compatible with manufacturing processes for rapid diagnostic tests. Any liquid sample can activate the paper-based batteries, according to the company, which suggests their product could be used in the areas of infectious disease, veterinary medicine, and women’s health, to name a few.

Scientists Juan Pablo Esquivel, Neus Sabaté, and Sergi Gassó of the Microelectronics Institute of Barcelona started Fuelium in 2015, and according to OZY, they have signed their first contract. Esquivel told OZY their paper-based batteries are small and inexpensive, and don’t require recycling; instead, they can be tossed out with zero ecological impact.

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