I say "bingo" to myself. Sea level has lots of anti-electric problems: (1) denser air, (2) moisture in air from sea meaning more resistence in the air, (3) usually the sea is cooler, which means, you guessed it, denser air, plus the battery gets suboptimal temperatures and more heat has to be used to heat the battery, and (4) the sea moisture in the air probably water-cools the battery even more thus causing it to be even further too cold and use more energy to heat it.
That still doesn't rule out some problem.
Maybe have a sense of how dense the air is. When you stand outside the car, swoop your arm wave your hand through the air regular-speed (slowly, not too fast) and feel the resistence against your arm hand. If you do that every time, eventually, you'll get a sense of the air denseness at that location at that time (but don't throw your arm socket out doing this; I just tried it with my arm and it felt like my arm was getting ripped out of my body; maybe just lightly swing your arm hand, not very fast, and increase your sensitivity, not your speed; I just tried that slowly with my hand waving through the air slowly, and with my hand against the air, I was able to feel the air thickness without ripping my arm out of my body). You can also stick your arm out of the window while driving, but be careful not to have your arm chopped off by a sign, car mirror, truck, motorcycle, tree, bush, or other road diet menaces (and I've seen my mirror chopped off by passing trucks, cars, signs, bushes, and motorcycles enough to recommend you don't stick anything out the window unless you're on a country road with no signs, vehicles, birds, cows, fence posts, plumbing, bridges, hay bales, rocks, telephone poles, or anything else).
