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"How much power left?"——we often face this problem in dailylife. But it is difficult to find the answer. People throw away a lot battery which remain a little power, resulting more waste of resources and environment pollution.
Energy ring mounted on the bottom of battery.Through the depth of color,user can tell how much power remine easily. So that battery can be taken most use.
Shaanxi University of Science & Technology
Shaanxi University of Science and Technology