 After the concept was put into the pipeline for production , General Motors began looking for a partner to develop the Volt 's lithium @-@ ion battery pack . The carmaker evaluated about twenty @-@ five different battery cell chemistries and constructions from around two dozen lithium @-@ ion battery makers around the world . Due to their more promising cell technologies , two companies were selected in June 2007 , Compact Power ( CPI ) , which uses a lithium manganese oxide ( <unk> ) cell made by its parent company , LG Chemical ; and Continental Automotive Systems , which uses lithium iron phosphate based cylindrical cells made by <unk> . By the end of October 2007 CPI ( LG Chem ) delivered their finished battery pack prototypes , and <unk> delivered theirs by January 2008 . General Motors testing process was conducted at the laboratory the carmaker had created for the GM EV1 program . The battery packs included monitoring systems designed to keep the batteries cool and operating at optimum capacity despite a wide range of ambient temperatures . In order to make sure the battery pack would last ten years and 150 @,@ 000 miles ( 240 @,@ 000 km ) expected for the battery warranty , the Volt team decided to use only half of the 16 kWh capacity to reduce the rate of capacity degradation , limiting the state of charge ( SOC ) up to 80 % of capacity and never depleting the battery below 30 % . General Motors also was expecting the battery could withstand 5 @,@ 000 full discharges without losing more than 10 % of its charge capacity . 
