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Cell phone is connected to battery charger. Many people dont know when battery of cell phone is 100%. When battery is 100%, another battery is charged at the same time. When you use all battery, you can use another battery which is very small. You can connect it under cell phone. And then you can use cell phone more time. In addition, You should not carry big battery charger.
Yongin-si, South Korea
Kyung Hee University
Yongin-si, Gyeonggi-do, South Korea