Wasn't it Toshiba that had their batteries with the iron hydride anodes just kind of slagging out?
Their name comes up in our LANR articles ~ must be something they really want to know about.
I have wondered about this, generally...energy density is a Good Thing, and so is rapid charge/discharge, but in the event of a mechanical failure or deformation, where does the energy go?
Most capacitors have a self-discharge rate much higher than batteries - but good, cheap ultracapacitors might be very useful for “burst” power or storing energy from braking, and so on.