I went down to the local dealer and asked how much it would cost to replace the 23 kWh high voltage battery pack in my 2013 FFE. The parts technician gave me the part number of CM5Z-10B759-K for the upper and lower batteries and quoted me the price of $8215. I also found this part number at http://parts.bartowford.com/oem-parts/ford-battery-cm5z10b759k for $7681. That's without labor and tax and equates to about $350 per kWh but that still a lot better that the $500 per kWh quotes we were getting just a few years ago.