An anonymous reader quotes CNET: Insurer State Farm and one of its customers, Wisconsin resident Xai Thao, allege that one of Apple's older iPhones had a defective battery that led to a fire last year. A lawsuit filed on Thursday by both State Farm and Thao claims that her iPhone 4S "failed" and "started a fire at Thao's home." The lawsuit further claims that "preliminary investigations show evidence of a significant and localized heating event in the battery area of the iPhone." It also declares that there were "remnants of internal shorting, indicating that an internal failure of the iPhone's battery caused the fire"... The State Farm lawsuit says that Thao's iPhone was "in a defective and unreasonably dangerous condition" when she bought it in 2014. The suit is claiming in excess of $75,000 in damages.