I know what they say, my scale says 218grams, that's with the end on. I paid more with shipping then I did from the hobby shop for the venom. So far the venom uses just 15 mah less at break-in amp's. I will do more testing when I fly them this weakend. The venom pack is a little smaller, but not much. I found out that the thunder power make the plane fly .2 sec faster than a nano tech battery.