I've been running the Dakota LiFePo4 batteries from Cabela's in my kids 12.5R for a few months now. No issues so far. He's 4 yrs old and doesn't go full throttle. I haven't timed it to completely dead, but he's getting riding well over an hour of riding. The bike is significantly lighter with these batteries. Well worth the upgrade. I bring the old batteries along in the truck as a backup, but have never needed them. I don't think he can last as long as the batteries in one day of riding. The nice thing about these batteries is you don't have to worry about the balance charging or running them down too low like other Lipo batteries.