This device (cut-off) is a combination of a voltage indicator for a three-cell cell-controlled lithium polymer battery and a controlled electronic key.
Can be used for fishfinder with external power supply from LiPo battery. To prevent the battery from completely discharging.
The cutoff is designed to supply the widest range of consumers with small currents (up to 2A) from model lithium-polymer batteries, including those with a significantly depleted resource, which can be characterized by a significant difference in the actual capacity of the cells, as well as the absence of internal protection circuits.

The presence of constant element-by-element control allows organizing the cut-off of the battery from the load when any of the three elements reaches a critical value of 3V.

The device displays the voltages for the weakest element:

- more than 3.7V - constant glow of the LED;
- 3.5...3.7V - LED blinking (on/off - 85% / 15%) ;
- 3.3...3.5V - blinking LED (on/off - 50% / 50%) ;
- 3.1...3.3V - LED blinking (on/off - 15% / 85%) ;
- 3.0...3.1V - LED blinking (on/off - 15% / 85%) + buzzer;
- below 3.0V - LED off, buzzer and load off.

The indication level threshold setting accuracy is 0.05V.

The cutoff connects directly to the battery balance connector (it is standard on most batteries). The cutoff output connector is a standard power connector for low-power batteries. In this case, the cutoff itself is automatically tested by a single blinking of the LED and the operation of the buzzer, after which the LED should glow constantly. Then you can connect the load.

TECHNICAL DATA:
Dimensions (without wires) 42 x 17 x 11mm
Operating voltage: 9.0...12.6V
Number of indication levels: 6
Working current, no more: 2A
Current in the off state, not more than: 5mA
Temperature range: 0 ... +40 C

ATTENTION! The device has a jumper that shunts the pass power transistor. When the jumper is installed, the load is not turned off and the cutoff works like an indicator.