Hmm, the two options you've suggested appear to be the same thing(?) Setting a limit simply makes the EV drop the "EV charging signal" to the charger once that limit has been reached. If the percent is already met, the EV will not accept an offer of a charge unless overruled by pressing a button near the charge port...I'm curious about your comment on the ability to set charging limits. It looks from the manual as if this feature gives you the ability to set a minimum charge level above which the battery will not charge even if connected to a charger. Does it work that way or does the feature allow you to set an upper limit for the charger? Why would that be convenient?