Recieved my batteries today from Antigravity. I purchased a 4 cell for my sx and an 8 cell for my xc. Not really tested them yet other than fitting the 8 cell and firing up the xc. It started the best it ever has. I always had the problem of it being sluggish to start and even though with old battery it turned over fine it sometimes wasn't enough if it hadn't been started in a few weeks. Here are some pictures and i also weighed them. Lead ytz7s - 1900g / 4lb3oz. Ag 8 cell - 800g / 1lb12oz. Ag 4 cell 450g / 1lb.