I run those same bats, but instead of your series plug setup I actually run one male plug, from the battery, through the vent and then from the other side run the female bullet, from the battery, through the vent. Then I connect those two together. Then on the ESC I only have the male and female on each wire. It works nicely because you do not actually have to have a series connector and looks a little cleaner.
I have not had any problems with them coming off either, nor did I cut the vents to stick them through. Just my 2 cents.