EC5 connector plug

This plug is intended for serveral things.
Initially, it was intended to be printed in different colours to show if the battery was fully charged (green), empty (red) or storage charged (yellow). But then I realized it did a few other things as well. First, it prevents shortcutting the battery by accident. Second, it protects the female connector from damage, in case some one drops something heavy on it.

Another thing that makes this different from other designs, is that it fits the female no matter what size of the blue cover you use for the female connector. See picture.