Well, all went well. Car works great now, although the stated capacity is 3000mah, vs stock battery 1000mah, I wouldn't have said it lasted quite 3 times as a long..... and as per the above post, they were ebay lithium 18650's....... so who knows the actual quality......that being said, I didn't charge them at all yet, so maybe they were not fully charged in the first place, I'll stick them on to charge shortly one they have cooled down and give it another go on the weekend.