>>1090604Find out how much your motor uses then use this calculator:
https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-battery-life1A = 1,000mA
1Ah= 1,000mAh
Find out how many amp house (Ah) that batter is. Like 105Ah = 105,000mAh. In this image it would be a 105Ah battery with a drain of 4Ah motor which will last 18+ hours. Though, always cut that time in half since you don't want to destroy your battery. In fact 1/3 of that time would be better (6 hours).