I wish to charge my p4 batteries when out in the field--I wondered about using a portable car battery jumper with AC input to run the dji charger off of-- any concerns or other suggestions? I am looking at items similar to this -- Wagan Tech 2464 Power Dome LT - 300 Amp Jump Starter with 260 PSI Air Compressor and 200 Watt Power Inverter - 12Ah SLA Battery