Review on MT3608 Boost Converter - Micro USB DC 2V-24V to 5V-28V 2A, Voltage Regulator, Power Supply Step Up Module 3.3V 5V 6V 9V 12V to 5V 6V 9V 12V 24V (Pack of 4) by Stephen Pendergrass

I bought this based on mostly good reviews. I was hoping to use them to boost the voltage of a 3.7L LiPo battery to 5V at less than 500mA. All 4 failed miserably. They were fine at 100mA (see attached trace). The output signal began to fluctuate above 100mA and began to draw significant supply current. Another oscilloscope trace shows a 200mA output signal. From there it only got worse. All 4 devices behaved the same, so it is not a single component failure. I've tried multiple input and output voltages with the same results. Totally unacceptable for any use and can easily damage your circuit.