12-36V Low Voltage Digital Protector Disconnect Switch Cut Off Lithium Battery Over Discharge Protection Module Pack of 2

Easy to use and worked as described. Using them in a speaker boxes that run off of power tool batteries.

So they do work but just as other stated they don’t shut off once it cuts voltage so set the voltage cutoff above the minimum amount to prevent damage. Give yourself time to change battery and no box either. But junction boxes can be purchased cheap to contain it. Or pour silicone over the bottom to insulate. But I would go the junction box. I buy these for my audrino chips all the time. Just get proper dimensions and I dremal slots out for wires so device doesn’t have to be removed from box. Obviously this isn’t ideal if your looking for waterproof. But that can be purchased as well if moisture is a issue

Works fine but would it hurt them to copy a small piece of paper with basic instructions inserted into the box or in the listing. Off the top of my head it goes like this. Press left button once to calibrate the input voltage to the actual voltage at the input. Disconnect voltage and reconnect voltage is set by a differential setting by pressing right button twice, decimal point starts blink when setting mode is ready and now set the the voltage differential that determines how many volts below set point and above set point unit will shut off or turn back on the output. Minimum is 0.2v possible differential, so for example you set 12v as the set point using the two presses of the left button and a disconnect and reconnecting voltage differential of 0.2v then the unit would disconnect at 11.8v and reconnect the output at 12.2v. This is off the top of my head, but that is the idea of how it works. Automatically saves setting in volatile memory after maybe 4 seconds if no buttons are pressed. One star off for no instructions.

Worked as advertised

Added one of these to my kids power wheels upgrade. I put 18v milwaukee batteries on his 12v mini atv but didn't want to destroy the batteries by running them too low. Cuts off right where I set the voltage which was easy to set. I think i had to look up how to set the voltage online because i don't think they came with instructions, but it was easy.

Worked great for a month. Note they won’t sync with each other.

Great

Works perfectly for my needs (cuts power to devices when battery goes below my set threshold). Easy to figure out how to set the values (I did not get a manual with it).