Battery powered neon signs, for where there is no outlet

Run time is the question everyone asks, so here are the real numbers rather than a marketing one. One set of 8 AA batteries lights a sign for 4 to 5 hours, and a USB power bank gives you the same 4 to 5 hours. When a set runs down you swap in a fresh one and get another 4 to 5, so covering a long event is a question of how many spares you bring rather than a limit of the sign. If you need days rather than hours, run the same sign from the 12V output of an outdoor power station instead; how long it lasts then depends on the capacity of your power station, not on the sign.

There is no size limit. Larger signs are simply fitted with an additional battery box, mounted on the backboard where the front view never sees it. Outdoor use is supported, which is the whole point: the places with no power are exactly the places these are for.