Hi NormK,
You must ran all 10 bucks in one battery but still battery shouldn't drain overnight. Check how how much total current drawn using a multimeter in series with the battery set at 10A.
Hi Tyler,
To know the total hours the battery will last is you devide the Ah by total current of the load. For example, your load draws 1.5A at 12V supply and your battery is 60Ah, so 60Ah/1.5A is equal to 40hours.
