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The No. 7 or No. 5 battery we used up at the end of the day will in fact have some residual power and cannot be fully utilized. Because these powers are small, if they can be brought together, the value it brings is also considerable. The purpose of this design is to use these remaining values. This battery No. 1 can be put into the used No. 5 or battery battery, and then collect their power, and then use itself as a battery. Only need one pair of one battery, you can collect residual power countless times, complete use is not wasted.
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