Batteries and capacitors, what are some differences ?

[petemoore]

  Beside the obvious, caps as do hold good charge for a while, I've not seen one yet for use suitable for power source where a battery might go.
  Capacitors last longer.
  Batteries, generally are used to hold charge longer under load.
  I've never read of anyone actually trying supercaps for audio or power source, only that it is feasable.
  And I've never read about anyone using a battery for a position in audio where a capacitor could go, for the obvious reasons, and not that I want that at this time, I just would like to know whether it is a feasable option.

[R.G.]

We just did this a few days? Weeks? ago. Batteries are like mega capacitors as far as charge storage. On the other hand, they do not block DC - they cause a DC voltage difference that sags as the battery's internal fuel runs out. Batteries do not have a meaningful reactive nature, in that they cannot be used in a resonant circuit; their current is always in or out of phase with their voltage, not at 90 degrees phase angle to it. Check on the search engine. There's more, I just don't want to retype it.