12 V for FF.
(my FF will not work at voltages below 10 V or so.)
(i don't think most FF will work at voltages much below 10 V.)
6 V for bait tank, before it crashed & failed.
(time for me to buy new one.
)
portable FM radio, with 4 AA batteries, which totals to 6 V.
good rock & roll playing, is a necessity of a great fishing trip.
.