Looking for a switch that cut off the power when reaching a voltage

[crozenfox]

Hi guys,

I have a fridge in my car, unfortunately when I leave it on for 5 hours the battery becomes completely empty. The car battery is old (7 years).
I'm looking for a switch that cut of the power when it reach a certain (low) voltage, so my battery will always have enough current to start the car. Is there any device switch with a small lcd screen showing the voltage ?
I would like to buy it from Aliexpress.
The fridge is a 5A 12V

Thnx.

[Gyro]

Such devices are very common on Amazon, and therefore Ali too. You can get them with built-in voltage display or just buy a separate voltmeter module, also very common in LED - I don't know about LCD but the LED display current consumption is insignificant compared to a fridge.

Just go and search for 'low battery cutoff' (or French equivalent).