It is a combination of battery power and energy from the research found that the service life of the battery can be used up to ten years without additional charge.
It was a combination of battery power and mechanical energy research found that the lifespan of the battery can be used for up to ten years without refueling charge.
It is the battery combination between using mechanical energy and electric energy from the research shows that the lifetime of the battery can be used for up to ten years without refilling charge.