Batteries used in pacemakers must be replaced after a certain period of time. Researchers have developed a battery that uses oxygen from the blood as an energy source.
Tests on rats show that the new battery is biocompatible, meaning it does not harm the organism around it, and delivers constant power after two weeks. More research is needed before a model can also be used for humans. But there is still room for improvement, say the Chinese researchers, who say they can achieve higher current output through other materials and an improved design.