Tried to fit the battery behind the wing spar under the passenger seat. Found it to be too difficult and not a practical location. Decided to put it in front of the rear wing spar on the right (passenger) side. Remembered that I needed to provide wires from the instrument panel back to teh area where the ELT will be located. I also need a wire from the instrument panel Master switch back to behind the passenger seat where teh battery will be located. Removed the chafe resistant covering over the wire bundle running along the right side of the fuselage cabin top longeron. Added the necessary wires and put the covering back over the wire bundle. Secured the wire bundle. in place.