This low voltage cutoff is designed to be used with 12V or 18-20V Lithium Ion batteries.
 
Low Voltage Battery Protector
 
Max amps: 3 If you require more amperage, use a relay with this board.
 
By default, this board blinks at approx. 15.9 volts for 18/20v batteries or 11.2 volts with 12v batteries. Blinks 2 times; stays on for 4.25 minutes; blinks 5 times; stays on for 1 minute, then shuts off.
 
If you bridge SP2, the board will shut off immediately without blinking (for fans, motors, etc).
 
It has an auto-select feature that checks for 12V or 18/20V system and selects its mode accordingly.
P1 = + IN
P2 = + OUT
P3 = - Batt IN
P4 = - Load OUT
 
P4 Goes to minus on socket or to whatever it is you are powering
P2 Goes to plus on socket or to whatever it is you are powering
Positive wire from battery goes to P1
Negative wire from battery goes to P3

Version 5.7 has reverse polarity protection on the in going side however it is VERY IMPORTANT that you do not connect the Positive and Negative wire on the outgoing side as that is a direct short and will ruin the circuit board. (Make sure to disconnect your battery from the Low Voltage Cutoff before connecting it to the appliance or your application.)

These are fantastic LVCs and I love using them on projects. Feel free to reach out with any questions.