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.
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