Very good 🎉🎉🎉

super 💪💪

super

Can you do another test? Make a graph of the input current as the input voltage drops from 4v down to 1v. I think the input current will drop to 0.0 when the input voltage drops below 2v. I need to know this so I don’t kill my Lithium Iron Phosphate cell. Thank you.

Solder the batttery after soldering everything else to avoid problems during assembly. A wrong connection during assembly with the circuit powered ON can start a fire. In the video you just avoided shorting the battery by the croc clip while soldering the output pin wires. Also you you have not provided any means to recharge the battery. Why solder the battery terminals? A battery holder with a pin or socket can help connect the battery to a load or charger - as & when required. Also a faulty battery can easily be removed & replaced with a new one.

how much price for this circuit and where i can get it

Stand by time?