I am from Australia with 102km on the car. More a weekend car.

I will measure the battery tonight, do I just use a normal multi meter and do I do it when car us off as well as when running? What exact voltages am I looking to have when in off and in idle?

I think I will replace the batter lead cables as well since they could be corroded inside and cant see, can someone please point me to where I can buy these leads with their rings from? In Aus if possible. Or can I purchase any generic car batter cable leads?