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Do i see it right, that every of the 4 batteries has to be charged/uncharged separately? Wouldn't it make sense to connect the micro USB ports parallel? While charging powered with parallel usb ports, every battery will be save and a balancing is not needed because of it's separate electronic. The only question which stays, is if the batterys will drain each other in standby through the paralell electronics?
Nice instruction for diy fixing. As A/C technican I had to note, that not only a clogged drain tub will lead into dew dripping. Also the drain tube itself will clog with alagea or the drain tub can get a crack an gets leaky..
3D Printed Voltage Regulator Circuit like PCB Circuit
Interesting and maybe a step to the real printed circuit. I wonder if the circuit will get contact corrosion at the gaps between the parts legs and the printing material. I assume due the lack of solder those gaps could behave like a battery together with humidity and could corrode. In my experience the low voltage stuff mostly fails because of a unwanted "resistor" with a few ohms ;-)Anyway, keep on developing it!
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