Thin, flexible caps that fit on all XT60 connectors and meet the air travel requirements for short protection. Some pilots like to choose colors to indicate charged or discharged as well.
(set of 5)
FAA Guidelines - Battery terminals (usually the ends) must be protected from short circuit (i.e., the terminals must not come in contact with other metal). Methods include: leaving the batteries in their retail packaging, covering battery terminals with tape, using a battery case, using a battery sleeve in a camera bag, or putting them snugly in a plastic bag or protective pouch.