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Simple creative electronic devices can be very very useful in emergency situations and in some locations or times with lack of essential or valuable complicated electronic devices .
I realize what you did wrong in the video you can't dismantle every single battery the safe batteries to dismantle is dead, carbon, zinc batteries the alkaline ones are more dangerous and lithium. Polymer is dangerous.
The "experienced electrician" hates you! This is a suicide device! What happens if you touch the blades while this is plugged in? This is just so stupid. And depending on the mineral content of your water, this "device" can also trigger the fuse.
Please make a video on this topic. I just did it so I haven't met the requirements yet. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jc50_PFqz_I.html