Right just something thats been bugging me eversince it happened and want to find out. Few weeks ago when i was out, go back to my car and found battery had died on me. Was a way out from home so had to call RAC out. But more to the point now, the battery that had to come out was a 600 size (not entirely sure on units sorry ). It looked like it was the original however as it was covered in this chinese looking Korean symbols so in all fairness had lasted 6 years. But when it came to replacing it what came up on this recovery guys computer was that the coupe standard was a 550? He wasnt sure entirely on putting it in but eventually did and so far has been fine minus the fact it cost me £97

What i wanted to know is - is the 600 the standard size for the gen 3 coupe and will there be any issue of having this smaller size battery in power wise etc???

that should be fine, I believe my battery at the moment is something like 975.

it puts a tiny bit more strain on your alternator if your battery is low and needs charging, but if you have aircon your alternator is already built to take a lot more strain than that.