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When a battery is exhausted, there is usually remaining power left in the battery. The residual-power is caused by low voltage. By connecting batteries in series, one can increase voltage to extract the remaining power.
Most used batteries remain approximately 1 voltage worth of power. The power adapter transforms regular 110V or 220V power input to 5V. Therefore, 5 used batteries can generate adequate voltage for charging electronic devices such as cell phones. Power Plant can function as a temporary charging station.
Yu Ting Hu