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Sometimes we need to replace batteries with new ones in our electronics. It’s likely to be happened that the batteries are mixed up inadvertently. It’s very hard to distinguish new batteries from another used, since its’ appearances are extremely alike; even if their exteriors are different, it’s necessary for us to know the present battery power so as to change or charge it in time. Consequently, I have designed “battery speaker” to solve the problem. The surface of the battery has a pressure-sensitive layer with the color recognition sensor. Just a light press, you can see how much the battery power is via the color of your fingerprint.
Beijing Institute of Technology