Power saver
Description
First, Happy new year to you all. I designed this small tool to collect the energy from the used battery. They may still have more than 70% energy inside even you can not use them for normal cases. This simple device can rise the small voltage to 5 V which can be collected by a power station. Next time I will tell you how to make a power charger as well. Hope it will help you a little. Save energy, save the earth, from ourselves now. Keep safe this time. Detail information on Youtube： https://youtu.be/evq0B95o6Go
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