Using 2 lifepo4 16ah miady batteries to provide plenty of power and no voltage sag. After using the power wheel on the grass, the gearbox eventually broke because the plastic wheels had too much grip at the start. I took the gearbox apart and fixed issues with the pins holding the middle gear in the gearbox being too short; also put a washer around the plastic to better reinforce it, after filling in holes with epoxy. If using this on cement or asphalt the gearbox will not break due to the wheels spinning at startup. Top speed is around 10mph.
This was originally a 6v red battery power wheel - Batman TrailRider, this is an older model from 2008.
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Batteries used - wired in parallel:
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Rod that I used for the middle gear - cut to 38mm in length in my case:
1/4 in. x 36 in. Plain Steel Round Rod
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Gas pedal that I had to replace due to wear:
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Replacement pins for the axel; you can probably bend the original ones back (that's what I was able to do) but having these on hand is good:
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Fuses for the batteries:
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Wires used to wire the batteries together for quick disconnect:
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Connectors for the battery terminals:
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