[adrian_b]

Batteries must always be talked about while mentioning both the stored energy and the maximum power.

These 2 battery parameters depend on different constructive details of the batteries. The stored energy depends on the volume of the electrodes (or of electrolyte in flow batteries), while the maximum power depends on the area of the electrodes.

All combinations are possible, e.g. batteries with high maximum power and low stored energy or with low maximum power and high stored energy or with both high maximum power and high stored energy.

For specific kinds of batteries, it may be easier to build them for high stored energy than for high power, or vice-versa.

Because for any kind of energy storage device both these parameters matter, the animals, like humans, have not much less than a dozen of combinations of energy storage and energy conversion methods, each of them providing different capabilities for the maximum power and for the total stored energy, so that they are chosen for use based on the duration and the intensity of the required effort.