Box 18650 3S + USB charger (powerbank)

thingiverse

Accumulator Block 3S with USB Charging Required: 1. XT30 Connector: http://ali.onl/18eS 2. USB Type A Motherboard: http://ali.onl/18eR 3. Voltage Converter: http://ali.onl/18eV 4. Six 18650 Accumulators 5. Protection Board: http://ali.onl/18eW 6. ICL7660 Balancer (Optional) 7. 3x15mm Screws, Leftover from Unknown Device Remember to bridge the two middle pins of the USB connector with a small amount of solder, as shown in the photo, or the phone will only draw less than 0.5A. Drill holes at the bottom of the case for potential attachment points. Before welding the accumulators together, it's recommended to test them first: fully charge and discharge them using an IMAX B6, ensuring all six batteries have approximately the same capacity. The pairs should also be initially identical in voltage, regardless of value, to prevent one battery from charging the other. I've removed the USB connector from the converter as it doesn't fit, shortening the board instead. However, I've increased the space for the converter in the model posted, so you may not need to shorten it. And, of course, "blue tape" is required for successful operation (Russian saying, joke). I also measured the load characteristics but couldn't insert the measurement device due to the block's design, creating a makeshift extension cable instead. If no voltage appears at the protection board output after welding, briefly apply 12.6V to the input to exit the protection mode. There is no power switch because the converter consumes almost nothing without a load.