I'd like to leave out the temp component and just figure out the peak detection . Some chargers (if it occurs slowly enough) will drop well over the setting for delta. I believe it has to be over a specified length of time. This is why I wanted to know the formula.

One example I can think of is the ice charger can see a drop of 1/2 volt very quickly yet still not terminate,,,,
Two different extremes , I suppose.