How to turn off the device when charging the battery?

Question

Do it yourself

I want to put a GPS tracker in the car, but I don't want to kill the battery if I suddenly leave the car for a couple of months without use.
Is it possible to connect a GPS tracker to some kind of relay in such a way that when the voltage drops below 12, or how many volts do the relay need to cut off the connection?
Are there ready-made such relays on aliexpress, ebay, etc?

Answer 1

The tracker eats less than the rest of the car stuffing, all kinds of comfort blocks, signaling and other stuffing.
Here it is suggested from below that in two months regular junk will gobble up 60 [days] * 24 [hours / days] * 0.035 [Amps] = 36 [Amps * Hours], that is, almost the entire battery capacity.
In order to decide exactly whether it is advisable to put something (Chinese, with Ali) into the wiring of the car, connecting this something directly to the battery (it would be necessary through a separate fuse, because there is a club in the cigarette lighter), it is worth measuring the current consumption after 10- 20 minutes of standing in the closed state with the tracker and without the tracker. It is possible that the tracker will not even be visible.

Answer 2

bca-12
12vi
with aliexpress 1 , 2 , ...

Answer 3

Better holistic approach.
For example, this one: https://stoprazryad.ru