It all depends on what your current battery set is and how much you use in a typical fishing trip. For example, I currently have two Bass Pro group 24 AGM batteries that have a 75Ah rating, and my 24V Terrova moves my 18’ bass boat around using only about 25% (can’t recall seeing my battery indicator showing 2 bars since installing them—I usually see 3 bars by the end of the day. Since I can run a Lithium down further than 50% to keep from hurting the batteries (probably down to no more than 20%), I should be fine with a 50Ah Lithium battery (either 24V or two 12V in series).
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