How long does the battery last on a kids' ride-on?

Run times vary widely. Listings claim anywhere from 40 minutes to two hours, but community sources (including r/batteries and r/ToysAndTots) caution that real-world run time is shorter under load and on grass, and that some cheap cars drain in about 20 minutes. Heavier riders and inclines reduce playtime, and many enthusiasts keep a spare charged battery.