Water Pump 12V Connection

Should be fine

 

Be sure to consider fusing when attaching directly to the battery. Small as it is, the battery is more than capable of using your added wiring to start fires, especially if you use fairly light-gauge wire because your added accessory doesn't need it heavy.

You want something that will interrupt the current as close to the battery as possible, in case of damage to your wiring.

Here's the strategy I use:

If you look at the car's positive cable connection to your battery post, there is a heavy fuse link (rated 120 amps or so) built into it. Make your tap from the car side of that fuse, not the battery-post side. (You can unclip the plastic cover that goes over that clamp connection and fuse. At the bottom of the part that goes down alongside the battery case, there is a bolted connection. Make a wire with a ring terminal and attach it there at the bolt. Now your connection is protected from the battery by the car's high-current fuse.)

The next step is to supply your own fuse, as near to that tap as possible, where your fuse's ampacity is chosen according to what your accessory actually needs, and what the wire you will be running to the accessory can handle. In the final picture, your added device and wiring is protected by the fuse you add. That can be one of the small, cheap kinds of fuse, because it in turn is protected from worst-case short-circuit currents by the heavy fuse link that's upstream of it.