Loading dead 9V batteries

I loaded two dead 9V batteries with a 100ohm resistor for a couple min, then removed the resistor.

Dead 9V Duracell:

Duracell's charge and discharge behaviour is expected. A dead battery discharges similar to a capacitor. Recovery is similar to a charging capacitor.

Dead 9V Energizer:

 
Can someone explain why the "weird" Energizer's charging/discharging? Perhaps it has to do with leaking cells inside the 9V, causing an unstable internal connection within the battery?