I've found that those same young kids also don't tolerate long periods in the car very well. The periodic stops to charge work pretty well - you stop, plug in

I've found that those same young kids also don't tolerate long periods in the car very well. The periodic stops to charge work pretty well - you stop, plug in the car, then take them to grab a bite to eat and blow off some steam. (Then you end up having to go unplug the fully-charged car long before they finish eating!)