Power Bank (4 x 18650)

thingiverse

Portable power banks are engineered to store four high-capacity Li-ion batteries (18650). They feature a single USB-A output and one USB-Micro-A input for charging. I specifically designed this model around the TP4056 module, which includes protection against deep battery discharge. To boost the voltage to 5.1V, I incorporated an MT3608 chip. Since the module consumes only 0.2mA when there's no load on the output, I chose not to include a switch before the MT3608. The wall thickness was set at 2 mm for added durability and protection.