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Each battery has itself size and type. People can’t distinguish the battery’s size with electronic devices. There are two situations what people have experience. First, people often confuse “which the battery size is AAA ?” and “The device(e.g. TV control) uses the AAA battery or the AA battery?”. Then, people have to sure the “+” side in devices attentively. Visible Battery improves batteries outside appearance with a simple method. It uses colors to replace the currently existing signs. In the way, people just need to see the color and use the same color batteries.
Yu Chun Chen,