[Dosa26]

Particularly in laser or magnetic rail gun weapons that need high amounts of energy for short bursts and then can recharge in several seconds from a traditional power source.

If they were set up in an array the short bursts could be as continuous and powerful as the hardware and power source could handle. Theoretically.

[Blood of Tyrants]

Yes, and the inherent problem with fuel cells is that they cannot change the amount of energy they are generating very quickly. If you put one in a car with a these new batteries, you could have the power output set at a mid range and you could run off the batteries practically all the time, charging when cruising at a steady pace or stopped and discharging when accelerating. Great for around town.

Might even be nice for a Bonneville Salt Flat run.