One of my ground cables, which links the battery to the gearbox has snapped. I used a caliper to measure the diameter of the wire, and it is approximately 6mm in diameter (so i calculated this to be approx 28mm² surface area).

I can only source 16mm² wire from automotive supplier that comes with lugs pre-attached (my preferred option than buying lugs and wire and crimping myself)

My question is, is 16mm² enough? It is supposedly rated at 110A. My battery is 53A so is that enough? My starter motor (which is defective due to the ground cable on the gearbox being snapped) is rated at 1Kw