The flashing process for the Titan takes longer than most vehicles, and you will run the risk of crashing the ECU if you do not use a battery charger. If the ECU crashes, you will have to send it to Z1 for recovery, which could take up to 2 weeks and cost up to $250 depending on the recovery method required.
I AGREE TO USE A BATTERY CHARGER WHEN FLASHING MY VEHICLE, AND I ACKNOWLEDGE THAT IT WILL BE MY OWN FAULT IF THE ECU CRASHES DUE TO LOW BATTERY VOLTAGE.