An aircraft carrier needs resupply with avgas every three days when operating up-tempo. Warships use up resources like crazy, they're not going off on five year missions like Star Trek.
...avgas? I'd hope it get refilled with JP-5, unless the naval aviation field has suddenly moved back to piston aircraft when I wasn't looking.
Indeed, although the article I found in Quora (from a carrier guy) actually used the term avgas and I didn't parse it :-)
Wouldn't that depend on how often the batteries were actually needed? That is, if the system is primarily externally powered and only alternately powered by a battery (under various conditions), it shouldn't exhaust those charges too rapidly. Or like some systems I worked on, the batteries were strictly for things like maintaining a clock and some volatile memory, very slow discharge rates, when the aircraft were totally shutdown.
Why? What will kill it before then? What kind of a battery would have a long enough shelf life?