I am working with a zinc air battery. When I short circuit my battery with a wire and record the voltage at the battery, my voltage is decreasing until 0 mV. Can I say that my battery is dead ? In other words, is a short circuit current equal to zero equivalent to a dead battery ?
Well there is an effect of relaxation in the battery. So after you remove the short circuit and let the battery sit for a while (30 minutes or something) it might build up some voltage again and you might squeeze out some more coulombs. I don't know how strong this effect is in zinc-air chemistries.
But when the short circuit was long enough for the current to drop to zero, your battery won't relax much and you basically killed it.