An investigation continues into the cause of the fire at a West Conn dorm on Friday night, but it could have started accidentally.  Officials are speculating that a lithium-ion battery was dropped down the trash chute and something caused it to heat up and spontaneously combust.  There was no evidence of combustible liquids and it’s not uncommon for lithium-ion batteries to cause fire if they get overheated.  An automatic fire alarm sounded shortly after 10pm Friday in Centennial Hall on the westside campus and firefighters responded to the scene quickly.  With Commencement ceremonies that weekend, there were few people in the building at the time.