🔋 Daier 5Pcs USB 18650 Battery Charger Module 2A Boost, Converts 3.7V to 5V 9V 12V, for Lithium Li-ion Batteries Review

The USB ports on all but one just fell out of my hand. None of them worked under load. I was able to set the voltage to the right value, but as soon as I added a load to them, they just turned off. Very disappointing considering how expensive they are. They go in the trash.

Cannot be used in dual mode if you turn on the device and charge the battery at the same time. The load cycle never completes because the load shuts down the controller. (This can also charge the battery). However, they can be modified with a cut and two Schottky diodes and work like a champ. It would also be nice if the "Load" and "Ready" pins were available so they could be controlled with an external device.

I have used this board to add batteries to my MIDI controller and it works very well. My multimeter shows that the output voltage can be adjusted from 3.7V to 27V, although I only used it to power 5V. The board is quite small and can drive multiple cells in parallel (make sure beforehand that they have all the have the same voltage). you will do it). If I ever need more 3.7v battery management boards I will buy them again.