From what I was told the battery types are "Prismatic" type cells... this is a possibility... but the voltage is too low...

http://www.all-battery.com/Li-ionPrismatic-30052.aspx?utm_source=GoogleShopping&utm_medium=GDF&gdftrk=gdfV26767_a_7c354_a_7c922_a_7c30052&gclid=Cj0KEQjw4ZOwBRDoxpjAvPXAl5MBEiQAEek_3tXlxxfSvHoLgryUp0P32JEGDfJKPtqJDN0pKRhYuZ8aAnhG8P8HAQ