[Darren69]

They changed the starter motor gearing so they could use a smaller Ah battery but they are still a swine to start sometimes. I can check mine later but I suspect it is the Motobatt MBT12B4 in my S4.

Upgraded battery cables like Exact start are supposed to be a big improvement for starting over the standard ones and its on my wish list.

I don't see a problem fitting a larger Ah if it is physically the same size it should fit but perhaps someone who may have done this already could advise.