jaapv wrote:Umm - isn't the delay part of the modifications? It shows that it has been carefully thought through.
The engine starts for charging during driving are magnitudes more frequent than the ones for high power demand.
As there have been zero reports of worn ICEs - indeed, any ICE trouble- with plenty of cars around that have done hundreds of thousands of kms, they clearly did an excellent job.
I fail to see what this mechanical thing has to do with the state of charge of the battery, come to think of it, I am sure that the engineers who worked on the electrics are not the same engineers that worked on the mechanical part.
The whole point is, I don't trust statements from those engineers. There is clearly something that isn't good about loading the ICE less than 48 seconds after a cold start, and they try to avoid this scenario, yet they allow it to happen if you suddenly demand power.
What is known about Li-ion batteries is that leaving them at a high SoC and at high temperatures for long periods of time causes extra degradation. OP has already stated the following: "I will have plenty of time to charge it when I return before I will need to drive it." As such, there is absolutely no reason why the OP should leave it charged. It can only hurt, it cannot help. As I've already said, the best policy for your battery is to charge it up such that it finishes charging less than 1-2 hours before you drive it. Over long periods of time, this lowers the average SoC and thus the total amount of degradation, and the effect is cumulative. It won't matter much what the OP does for this
specific trip either way, but you don't want to make a habit of leaving the vehicle plugged in and fully charged all the time.