Abstract: In September, 2009 Electric Transportation Engineering Corporation (ETEC) was awarded Contract 82628 for the UltraBattery Development and Testing project[1] by the Idaho National Laboratory (INL), operated by Battelle Energy Alliance, LLC (BEA). The primary objective of the project authorized under this contract was to evaluate the performance of the UltraBattery® – an advanced lead-carbon technology manufactured in the United States by East Penn Manufacturing and operating in mild hybrid electric vehicle (HEV) duty. Contract 82628 was amended from time to time and ultimately encompasses ten work tasks. Task 1 through Task 3 consisted of extensive laboratory testing to characterize/benchmark and evaluate UltraBattery modules manufactured by Furakawa Battery Co. Ltd., Japan (FUB), UltraBattery modules manufactured by EastPenn Manufacturing (EPUB) and the nickel-metal hydride (NiMH) modules installed by the OEM in a 2010 Honda Civic hybrid. Task 4 through Task 8 consisted of replacing the original NiMH battery in a new 2010 Honda Civic Hybrid with a battery pack of 14 EPUB modules. After completing the initial conversion, ETEC tested the UltraBattery equipped Honda Civic in and around Phoenix, AZ under the Advanced Vehicle Testing Activity (AVTA) of the U.S. Department of Energy (DOE) FreedomCAR and Vehicle Technologies Program. Task 9 was initiated to test battery modules produced by Exide and was unrelated to the UltraBattery work conducted under Tasks 1 – 8. Finally, Task 10 was initiated to conduct additional laboratory testing of the UltraBattery as described in this report.Work was completed by ETEC on Tasks 1-9 and that portion of Contract 82628 closed out. Work on Task 10 continued through January, 2013 when the Principal Investigators for this work moved from ETEC to Electric Applications Incorporated (EAI), where work continued on Task 10.