According to preflight procedure you have to insure that both tubes hold -10 psi pressure for at least 15 minutes test tubes. After pressure test it complete tubes should not be opened. This makes you power your ROV and wait for 15 min pressure test while draining the battery. On any given mission these 15 minutes of extra flight time can be critical especially in colder environment. Upgrading your ROV with a powerful mosfet switch will will disconnect you battery in pressurised tube and switch it on just before splashing.
XT-90 Connector on battery side.
Female bullet terminals on the bulkhead side.
M3 screw attachment to the bulkhead.