kids pedal car - electrical conversion !

[routercnc]

I think you may have figured out next year's project - emergency drogue chute and zero/zero ejection system,

Not quite but it made me chuckle - closest we will get to that is probably a seat belt.

A_camera,
The charger is a new model sent to me by Banggood (for free to show in the video) for 12V or 24V lead acid batteries. So far it has worked fine and we've had several charges out of it, usually while I'm nearby. My main complaint so far (as noted in the video) is that the UK plug they supply has no fuse. My plan is to open the unit and see if I can solder on a fused cable and plug. That will give me a chance to look it over at least.
However, I have no issues with anyone choosing a known branded one for peace of mind, especially if they plan to do unattended charging.

As for the brake system:
The brake is not electrically operating - it runs mechanically via a brake cable to the brake disc. The switch is just to turn off the throttle to stop them both being on at the same time. In practice if you press both pedals together (without the inhibit switch) the speed controller instantly switches off due to the motor going over current so you will always override the motor and come to a halt - it's actually not very powerful (300W) when compared to the power of the disc brakes. So even without that system it will stop pretty quickly. I decided to include that feature since it was easy to do. On a much more powerful system that might not be the case.

By the way if the wire breaks the kart still will not stop. You have to press the pedal. It just means that it won't automatically cut the throttle, although as I've found out it doesn't amount to much extra safety in this case.

I understand your general point though and what it means if you think about it is that all the electric bikes running around that use that type of controller (there must be a few!) will have a switch to make a connection when the brake is applied. I know on our CNC machine limits we break the signal to indicate a fault, but this controller is wired up the opposite way around. I'm personally not too worried though for the reasons above.

I'm glad most people have found it interesting, that does make the effort involved in filming and editing and uploading worth it. Most importantly my daughter absolutely loves it and only comes in when she gets too cold (wind chill effect maybe?). Happy holidays.