The quick return to 100% is interesting. Have the battery cables been cleaned lately?
Just looking at them will not indicate a bad connection. Try loosening the cables slightly and give them a bit of a twist and see if that does it, otherwise take them off, negative first, clean them with a wire brush or something abrasive, and reassemble positive first.
You could very well have a bad battery and it is 3-4 years old. Having taken it down to dead at this stage of it's life would definitely tilt toward replacing it. Being that age, I wouldn't even bother with a load test unless I had easy access a tester, which I don't. If you want, you could pull the battery, charge it, and then take it to an auto parts store to get load tested. Like I said, the age of the battery would have dictated replacement for me. Having a battery go down in the middle of nowhere pretty well sucks.
Just jumping it will not fix a bad battery.
Bummer on the rough start to your trip.
BTW, it was 78* at my house.
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Tick tock, baby(Ironbuttal)
2000 Roadtrek Chevy 200 Versatile(sold)
'98 Safari Trek 2480
Just for fun:'15 Kawasaki Versys650LT
Perfection is a fantasy, though improvement is possible(Wifey).
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