Have you ever tried to make a headways cell do anything exciting? I've overcharged them to +28v then -28v, charged at 150amps to 16v, shorted them with busbars, shot them through with an aluminum crossbow bolt multiple times, smashed them in a vise, cut them in half with a hacksaw, and finally, the only way I got one to do something exciting took 15minutes with a 1800w heatgun blasting on it until the organic solvents boiled and vented a flamable vapor that lit. The steel can of the battery was glowing before the solvent would boil and ignite.
If you know a magic trick to get one to do something exciting, please do tell. I was stabbing things through full charged cells repeatedly, and grinding the layers together with no ill effects.
I would feel comfortable building carseat for my baby out of headways cells.