I have seen it happen with my HCHII, but I have to wonder why you would think it is that desireable? Running on battery is less efficient than running on gasoline because the conversion efficiency in converting mechanical energy into electrical and then back to mechanical is way less than just using the mechanical energy of the ice directly. If Honda had programmed the system to run exclusively on battery for long stretches, it would have lowered the fuel economy overall.

The energy in the battery is not free. It gets there from braking (which initially came from the acceleration produced by the ice), coasting down hills, or from extra load on the ice specifically to recharge the traction battery. Bottom line is that it came from the gas tank one way or another. Its usefulness is in reclaiming energy that would otherwise be lost.

I drive my HCHII so that I use the IMA the least amount possible although living at the top of a 2000 foot hill makes that difficult