Just before 4am , Station 62 was dispatched to the 300 block of Crest Road for an possible electrical fire inside. 62 Chief Officers along with Engine 62-1 and Rescue 62 arrived and determined the source of the fire to be a battery pack. Crews confirmed the fire was extinguished quickly and ventilated the smoke condition inside. Chester County Fire Marshals are investigating. Crews were in service for about an hour and a half.