If 140mm is the absolute max you could go with these
http://www.hobbyking.com/hobbyking/s...dProduct=15004 137x43x28, 3300mah, 30/40C and 375grams. $32.21 plus 1 cent shipping.
P.s. I'm only looking at lipo's from the USA warehouse as shipping is MUCH cheaper and they will warranty them without having to send them overseas.