I've developed a device that runs on a 12V lead acid battery. The device will be deployed at a location where we cannot have physical contact with it. It is therefor not possible for us to detect the battery's voltage.
I want the battery to last as long as possible, but I don't want it to deep discharge. For this reason I wanted to implement a low current voltage cutoff circuit, but I am having trouble finding any. There are several that 50-100 mA, which already is too much.
What are low current cutoff devices or how can I make one?