If running lipos, you can get dirt/debris in your balance connectors. To prevent that from happening, I just take an extra male connector, remove the wires and maybe pins, and hot-glue the any openings. So, before I go out, I just snap one of these over the balance plug on the pack and it keeps it clean.
A picture of a Hyperion on the left and some other type (don't remember which) on the right.
You can't see it, but both have hotglue in the back where the wires originally were.
The one on the left has all the pins removed since the casing has the latching mechanism.
The smaller one on the right has just a couple pins removed just so it's not so hard to put on/take off, yet stays on firmly. Should be snug enough to stay on during running, but not so bad that it takes a Kung-Fu grip to remove it. I also wrapped heatshrink around it to help seal various other openings, and also filled the back with hotglue to give me something for my fat fingers to grip.