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Message: <blockquote data-quote="MrGiggles" data-source="post: 492399" data-attributes="member: 22613">12v motors draw roughly 1 amp per pound of thrust running wide open. Given a 50 amp draw, that battery is likely around 100ah, which gives you less than two hours at 100%.If that's a digital motor, they're pretty efficient so it's fairly accurate to just double that number for a calculation at 50% speed.The only situation where you might find an upgrade worthwhile is if you like to troll at moderate speeds (1.5-3mph) for long periods of time. That takes a lot of battery capacity. Most guys with smaller boats like that just use a single large battery and get along fine.</blockquote>