This module works pretty well. I have set it up to protect a 3s lithium polymer battery (minimum voltage 9v) and even though it's supposed to be minimum voltage 12v it works well with this setup. The left button controls the disconnect voltage and the right button how much greater than that it needs to be to reconnect. I advise a minimum of 0.5v with lithium battery to avoid short cycling and wearing out the relay too fast.