“I purchased one of these controllers to create a homemade UPS for my Raspberry Pi Zero W, works a charm. Connected a few 18650s up to the controller and powered the whole thing up and had no issues whatsoever. Only suggestion would be to make sure you solder the USB output connector onto the board before testing the unit, I thought I had a dud but once the connector was securely soldered on all my issues disappeared.”
“Great in almost every way. i2c or similar battery voltage measurement, or even a programmable low/cutoff would be better than fixed as I'd prefer to choose a slightly higher warn level in my application.”
