For real. I’ve seen kids years younger than when I started pedaling scurrying around on these, and it instantly clicked why it’s a much better way to learn to stay upright on two wheels.
I wish my first bike had been something like that. Training wheels stop a bike from leaning into turns, so they don’t teach you anything about what it is like to ride without them.
Batteries catch fire. Very large ones, or many cells together can mean a very hot, very dangerous fire, with the occasional violence of a cell bursting.
Being in close contact with something like a phone when that happens would cause burns, but they don’t “explode” with very much force. (Relatively speaking. You wouldn’t get lethal fragmentation for example, I don’t think)
The note 7 batteries didn’t really go boom in the way an actual explosive does, though the reaction is a sudden and fast release of thermal energy, its not that much energy in terms of explosive devices.
So no. You can’t “hack” a phone and turn it into a bomb using just the hardware that is already inside. You could start a fire, and that could be deadly, but as an explosive device the battery in most phones is not that potent.