Those are some great questions. First of all yes it does matter if your using full throttle all the time. It will quickly deplete the charge.
Size matters. The size of your battery and if it is fully charged matters a lot.
Also if you have a cheap Minn Kota Endura or a Maxxima or a Traxis matters. The reason is the Endura is their bottom end electric and has numbered settings for the throttle. So for instance you can have 1-2-3-4 or 5 speeds. One the Maxxima or the Traxis you have a variable throttle. The variable throttle will help your battery last longer. As you don't have to rely just on the predetermined settings.
Is there a setting that maximizes your over all battery performance? The short answer is yes. Anything under half load seems to help considerably with duration of the battery. As I said size of the battery and the amount of charge are big factors as well.
Should you put the prop just under the hull or lowered all the way down. Just under the hull is sufficient. You can drop it down a bit farther if you want it out of the way. Just be careful if your in shallow water.
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Fishing isn't always about catching fish.
Sometimes you just have to take a deep breath, look around, and admire what mother nature gave us.
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