Help selecting battery please?

Chagrin:

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.

Sorry again I'm not too sure what u mean, do you mean that if I use the battery till the voltage drops so low I am damaging the battery?