On toyeast they show these NIMH batteries... one of them is much cheaper than the other... If you look closely the batteries do not look identical... Anyways.. .they both have the same runtime,700 charges,etc... but which 1 is better?
http://www.toyeast.com/proddetail2.asp?pdtid=AMPER001
http://www.toyeast.com/proddetail2.asp?pdtid=AC2014