Brother Industries has developed small vibration-powered generators that can replace AA and AAA batteries:
Specifically, the generator can be used for a device that does not always consume electricity and has a power consumption of about 100mW, the company said. For example, the power consumption of a normal remote is 40 to 100mW.
This time, Brother Industries prototyped the generator in AA and AAA sizes. Inside a battery-shaped case, there are an electromagnetic induction generator and an electric double layer capacitor with a capacitance of about 500mF. The average output of the AA-size generator is 10 to 180mW (frequency: 4-8Hz).