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The company FastCap has updated their website where they claim their ultracapacitor has 

18.69 Wh/L (15.66 Wh/kg)

Take a look!

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FastCAP Systems uses nanotechnology to improve an energy storage device called an ultracapacitor (ultracap). Our ultracaps are the durable workhorses of the energy storage field, with extremely long life spans and unmatched durability. They recharge in just seconds and can deliver very strong bursts of power — far beyond the power capabilities of traditional batteries and ultracaps on the market today. Importantly, FastCAP's ultracapacitors contain no lithium and carry zero risk of thermal runaway explosions — a stark contrast to volatile lithium-based battery chemistries that are prevalent today. FastCAP's high-performance ultracapacitors stand to make a huge impact in industries and applications where harsh environments are the norm, and safety, reliability and ultra-high performance are essential.


Geothermal energy production holds great promise to provide substantial and globally available renewable energy resources in the decades to come. Distinguished from intermittent renewable energy sources by its 24/7 and near ubiquitous availability, geothermal is the only renewable energy source that is capable of providing base load capacity to the grid. Widespread deployment would be a game-changing proposition.

To date, however, technology limitations have held back geothermal energy exploration, and technological advancements are essential to unlocking this vast resource. That's where FastCAP stands to make a big impact. The key to the success of geothermal energy production is the ability to cheaply and quickly pinpoint the most ideal and productive geothermal resources in real time during exploration. Technology capable of this has been utilized in the oil and gas industry for decades, but due to the drastically higher temperatures frequently encountered in geothermal wells, many oil- and gas-ready technologies are not transferable due to temperature limitations.

FastCAP is bringing its expertise in extreme environment energy storage to the table in a project funded by the DOE Geothermal Technologies Program to develop a first-of-its-kind geothermal power system for directional drilling that is capable of safely and reliably operating in the temperature extremes typically encountered during geothermal drilling operations (250C +). FastCAP expects to demonstrate a prototype of this breakthrough system in 2014.

Visit our products page to view FastCAP's suite of directional drilling power systems currently being deployed in the oil and gas industry.


FastCAP's validated world records in energy and power density will enable a new generation of cost-effective hybrid and electric vehicles. FastCAP's technology can help make widespread deployment of hybrid and electric vehicles an affordable and high-performance reality.


Energy storage is a limiting factor in the size and cost of a wide variety of consumer and industrial electronic systems. From LED lighting and smartphone charging to industrial automation and server micro UPS, cost-effective and consumer-friendly solutions require better, smaller capacitors.

FastCAP's high-frequency ultracaps enable 20-100X size reductions over electrolytic capacitors (rated for 12V or less) for critical offline power factor correction. For low-frequency power buffering, FastCAP's high-energy and power ultracaps can achieve size reductions of up to 3X over ultracaps available on the market today.


​FastCAP Systems is dedicated to providing breakthrough technologies across the energy spectrum, and is excited to introduce its suite of novel power systems for oil, gas and geothermal energy exploration. These systems will enable a step change in the way energy is stored and utilized in drilling operations — allowing for safer, more efficient and less polluting energy exploration. That's good news for our customers, and for the environment.

In my four decades of work in the downhole battery industry, I can’t think of a more exciting new technology than the Ulysses Power Systems. We are talking about downhole storage that is rechargeable, lithium-free and offers 10X the power of primary batteries. The drilling industry has waited for a modern breakthrough in downhole storage. I’m excited to say — the wait is over.— Jim Epstein, Chief Engineer at FastCAP Systems
    Former founder and VP of Battery Engineering

Our breakthrough power systems are enabled by FastCAP's proprietary Extreme Environment ultracapacitors (FastCAP EE), which are rechargeable, high-powered and lithium-free storage solutions, engineered to safely and reliably operate at temperatures up to 150°C. FastCAP EE cells, unlike lithium-based primary cells, do not pose a risk of explosion in conditions such as overload, forced overcharge, over voltage, temperature swings, over temperature, shock, vibration, torsion, or when breached, crushed or damaged. Further, they carry no risk of thermal runaway-related explosions. Exciting new FastCAP EE-based solutions for 200°C and 250°C applications are currently under development.

In addition to increased safety, FastCAP's power systems offer benefits and breakthrough performance along the full spectrum of MWD and LWD operations — from efficiency solutions that allow customers to achieve runtime extensions for 8- and 10-cell battery packs of up to 2X, to game-changing systems that enable customers to completely eliminate primary batteries from their MWD and LWD operations.

If you are interested in learning more about our breakthrough downhole power systems, or would like to us to design a custom system to address your specific needs, please contact us.​ 


Sounds really neat.

I do tend to be reluctant to get really exciting when they talk of nanotech making improvements. Yes it works and makes great improvements, but until the costs and production are working it isn't too promising.

That being said, this looks really promising and should keep an eye on them. It looks like they may be highly connected and could pose trouble for eestor if they don't hurry up.

It doesn't seem worth getting very excited about 18.69 Wh/l when EEStor's layers test at 74 Wh/l, perhaps down a little due to packaging.  It does depend on relative costs per Wh though.



Might not be that significant for EV's but.........

If not too leaky and cheap enough they could replace lead acid in many applications with none of the problems with cycle life, ageing and depth of discharge.
Almost instant recharge and long life could replace NiCad and NiMH in some applications.
If the frequency response is not too bad then it would get a chunk of the aluminum electrolytic market too.
I can get quite excited about this but it all depends on price
regards Simon

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