Electronic – Supercap compared to a battery


What is the current state of things when it comes to super capacitors and batteries? Are super caps anywhere near rivalling LiPo's in capacity?

I've often heard people talking about super caps as being a viable replacement for batteries, in that you can charge virtually instantly and recharge millions of times, but is this just a pipe dream?

Best Answer

Some ballpark figures I remember from a year or two ago:

  • Batteries have 10 times the energy density of supercaps.

  • Supercaps have 10 times the power density of batteries.

So for the same size you can store a lot more energy in batteries, but draw much more power from supercaps.

That's why some trams use supercaps and not lithium batteries.

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