Power Wheels batteries don't have much run time. Grandson was always running out of battery and having me get my lil old four wheeler to tow him back. Since it is a Gator with room in the bed I screwed down a marine style battery box, the big one. Rewired the machine cause I'd heard about a recall for melting wires, and put a group 31 stud post battery in. He don't run out of battery now. Battery weight in the rear sort of helped traction but still just spun tires everywhere and on any kind of hill. This battery has amps.
I used my sawsall and cut the tread off the old four wheeler tires that I never got around to throwing away. Used most of a box of screws and wrapped the tread around both rear tires. It don't spin, anywhere.
I've had to replace a motor, the brush melted off, gone. Fortunately someone had tossed another Power Wheels in the Dumpster so of course I stripped out the motors and gearboxes. A Guy has to have spare parts.
G'son has already outgrown the toy, it's been years already. Someone in the family with a little one is about to get lucky.