Yes you can but anytime you jump start your bike with either another vehicle or one of those "booster" battery chargers, you are risking damaging the electronics on your bike with a voltage spike. I'd prefer to use a slow charge battery charger overnight to build the battery up to the point where it will start the bike. If the battery is over a year old on your Fat Boy, take it out and have it load tested. The Softail bikes are extremely rough on batteries due to the heat and vibration they are subjected to inside the horseshoe oil tank.
Good Luck
Steve
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