I'm not sure you can? From what the dealer and even the posts above stated that the battery will drain all the way to 1%. IF that is the case, why plug it in when it should charge the batteries while driving. that is why allot of auto makers will add another generator through the transmission to the to assist with this. or modify the current alternator to output to a separate terminal bank to charge the batteries. Maybe Jeep figured there was not enough room to do this? not sure, but there are PLENTY of Hybrids out there that DO Not need to be plugged in.Um...You can use the engine to recharge the battery. There's no hybrid or EV on earth that can fully charge its battery solely through regeneration. That would break the laws of thermodynamics.