So far I've used both 'charge now' and timer. Both have worked fine. The timer has finished an hour or two before the finish time I requested, according to the emails I get from Entune.
Can you explain what do you mean by active? Prime and PiP have forced circulating air cooling, not natural circulated - for me this is active.
dammit, the web ate my post. Yeah, I dropped the liquid there. Liquid is better for in terms of maintaining battery life, and reducing winter loses. The extra cost and weight, mean active air is fine for a PHEV with a smaller battery. There is still the ICE in the event excess heat or cold effect EV operation.
Winter here, so time of day didn't seem a concern for heat, but now I know why this is helpful. I had mine set on, but then twice I forgot when I plugged in day-time that I had it set for ready at 7:00 AM. Turned it off now.
For whatever it's worth, I'm not optimistic about the P.Prime's air-cooling idea. Sounds like a repeat of the Leaf, which started it with air cooling (some claimed "no cooling"), got hit with a class-action suit, and switched over to liquid cooling.