calvingloster:
Sorry I do not understand what u mean by the battery is well on its way to the store in the sky?
If you're describing a 6V lead acid battery, drawing it down to 4.85V would be killing it. ~5.25V would be the lower limit. After 6.0V there's only about 10% capacity left so it's not worth it to take it much lower than that, and the lower you take it the less life it will have.