cheers for the replies, i have cleaned and re tighten the terminals. Issue has pretty much only come up once in the last 2 or so months, one other thing i notice is when i'm getting a jump start from another car (it will immediately start, no need to wait for it to charge up). I have been looking at getting a SCA Jumpstart - 900 Amp, Heavy Duty from supercheap auto, has anyone ever bought one if so are they reliable.

thanks again.