The flip from a 3 year La Nina, to 1 year El Nino, then quickly back to La Nina is really interesting.  It seems there isn't symmetry between the 2 phases.  Would it be accurate to say ENSO processes are similar to the process of a volcano gathering molten magma before eruption?

As well, there have been numerous explanations for the ENSO cycles (trade winds being the huge factor) but one of the more recent parsimonious explanations is volcano like as it states:

"Think of the tropical Pacific as if it is a battery storing a charge, and the charge is thermal radiation coming in from the sun.  Every cool La Nina phase is like a battery gathering and storing a charge from the sun, while every El Nino phase is like a battery discharging its thermal store."

This seems logical and to the point, without getting into trade winds and other complicated dynamic atmospheric processes.  But is the above description accurate? 

The above description does help differentiate ENSO as a standard atmospheric process vs. being a climate change process, which seems to be a popular misguided view.