Go by Radio Shack or any good auto parts store. Pick up some wiring terminals like This
to go to the battery posts. Make sure the space between the lugs is large enough to get around the bolt on the battery posts and small enough that the head of the bolt will still clamp down on it.
Get a fuse holder like This
and a 10 amp fuse to fit it.
Get some split tubing like This
to protect the wiring.
Get some #14 (minimum size) red and black wire.
Splice the fuse holder into the positive side of the power outlet. Splice a piece of red #14 wire on the other end long enough to get to the positive post on the battery. End the wire with a spade lug.
Splice a piece of black #14 wire on the negative side of the power connector. It should be long enough to reach the negative post of the battery. Crimp a spade lug to the battery end of that wire as well.
Push the split tubing over the wires and run them under the tank to the battery.
Loosen the bolt on the negative battery post enough to slide the spade lug under the nut, and tighten it back down. Do the same with the positive battery post.
FWIW I never use crimped connections either and solder all my connections. Not everyone can properly solder connections though, and crimped is better than just twisted and taped.