Vacuum Pump Power?

I wanted to hook up an automated irrigation system of sorts, but the pump I've got just has bare ended wires.
What is the best (cheapest/safest) way to power a 12v dc 8.1a pump?
I've found a few adaptors, but they have max output of 7.5a.
I also found some batteries, but they weren't cheap and they probably won't last long?