Comments on: SuperCap 9V battery

By: voronin

voronin — Tue, 16 Aug 2011 14:16:15 +0000

I so want to stick my tongue to the end of that!

By: Shiekh

Shiekh — Sat, 07 May 2011 15:26:02 +0000

“Capacitors on the other hand can maintain their charge for years”
Super-caps discharge faster than batteries

One can get an array of 6 large super-caps (each 2500F 2.5V) for around $55
http://www.goldmine-elec-products.com/products.asp?dept=1471
and I put one in a UPS; so fast so good. Run time is short, but enough to cover glitches, and shutdown gracefully.

I found that at 13.6V they did not need balancing.

By: Michael F.

Michael F. — Sun, 03 Jan 2010 23:17:46 +0000

Impressive GET! Where do ya get your iPhone news? :) My hat is off for you.

By: Robert

Robert — Wed, 04 Nov 2009 17:31:43 +0000

IS THIS YOUR PDF?
http://www.scribd.com/doc/17684600/SuperCap-Battery

Meh, probably not… Though, the circuit diagram is there…

By: Anton

Anton — Sat, 24 Oct 2009 09:06:31 +0000

Now that’s what I call a capacitor!

By: Anton

Anton — Thu, 15 Oct 2009 12:37:48 +0000

The link to the PDF article is a broken link

By: spuffler

spuffler — Tue, 25 Aug 2009 00:03:53 +0000

Maxwell’s stuff is quite pricey. The smallest BC series at 350F is $72 today at a popular online distributor….. I can go through an awful lot of alkaline 9V batteries for that.

By: spuffler

spuffler — Mon, 24 Aug 2009 23:53:14 +0000

Ah I see yaleman posted the link on Decc 13 2007, use your browser find function.

By: spuffler

spuffler — Mon, 24 Aug 2009 23:50:51 +0000

BTW, with SMT PWM and some finagling, you should be able to get 2 of those caps in there, for 2x the run time, which means very close to the same as the 9V battery it is replacing.

By: spuffler

spuffler — Mon, 24 Aug 2009 23:49:02 +0000

The PDF file link is giving an error.

By: tantris

tantris — Sat, 16 May 2009 15:54:10 +0000

As mike, “…” and others have already pointed out: the energy a supercap holds is nowhere near that of a battery. You can use it however as backup power for things that use almost no energy (memory, some microchips on standby) or for something that runs intermittent. If parts are matched properly, a cap needs very little (read none) in charging circuits:
A small solar cell (6V for a 5V cap) can charge a cap directly. The cap will pull down the voltage and the voltage rises as the cap charges. Once it reaches 5V, you have to start using the cap, so the voltage doesn’t rise higher, or have a bypass zener.

By: Ed Ianni

Ed Ianni — Tue, 10 Mar 2009 15:23:08 +0000

I can’t find the schematic for the “Supercap 9v Battery” by Eliot Phillips anywhere. Has it been removed. Thank you. Ed

By: james

james — Sat, 22 Nov 2008 02:49:09 +0000

maganda

By: emmanuel

emmanuel — Fri, 21 Nov 2008 04:38:50 +0000

i want to try this but i don’t know where to buy

By: Mark

Mark — Mon, 22 Sep 2008 11:22:01 +0000

The link to the PDF article is a broken link…