Lithium Ion Super Capacitors

[@sandervandebor8309]

I have been using these capacitors in my wearables to eliminate coin cell batteries. Yes, these are larger than a coin cell, but I just love the fact that you can recharge these in just a couple of minutes. For my latest design I use a 90F 4.2V capacitor and use a standard battery IC to control the charging current and use the undervoltage protection. I have shorted the leads on accident and the capacitor got very hot to a point where it vents out through the top, but no explosion or fire. I have overcharged these as well to 4.5V, but nothing really happened, these still worked fine.

[@drunken-hamster]

I'm using hybrid super-caps for solar charged outdoor lights. I find the voltage range corresponds pretty well to what a white LED wants.

[@marcfruchtman9473]

Do you find these better than just a simple rechargeable lithium for solar lights?

[@drunken-hamster]

@@marcfruchtman9473 They're certainly more expensive and don't hold as much energy as lithium batteries, so not better in that regard. But, you don't need any sort of charge management. There's just the solar cell, a diode, and then hybrid super-cap. The diode is chosen such that the voltage drop gets you to 3.8V (the max voltage on my super-cap) at full summer sun. The white LEDs I'm using stop conducting around 2.4V so you never drain the super-cap too far. I have a simple comparator IC (LM311) that turns on the light when the voltage on the solar cell is below a tunable fraction of the super-cap voltage. Of course you need a current-limiting resistor to not fry the LED. I've had some running for a couple years now.

[@marcfruchtman9473]

@@drunken-hamster Thank you very much. I like the overall design, tho, Do you find that the LED is bright enough thru-out the night? Also, do you get hysteresis flicker when it first turns on/off?

[@drunken-hamster]

@@marcfruchtman9473 I'm using these for your typical garden path lights. I'm using TWO 220F hybrid super-caps (Eaton) in parallel and a high-efficiency white LED (Cree) drawing ~20mA at full charge. It's about as bright as a typical garden path light when it first comes on and will run all night but is pretty dim by morning (the fact that it's still lit in the morning means it didn't discharge beyond 2.4V). I was also concerned about hysteresis flicker but never saw it in any of the several lights I've been running for a couple years. The LED is just being driven by the LM311 output with a current-limiting resistor. Interestingly, you can make a PWM circuit out of comparators so it should be possible to use a dual or quad comparator IC and have PWM control. I made these lights because I found that you could buy a whole set of cheap Chinese garden lights and have all of them fail one-by-one within a year :( So, I tried to make the most bulletproof yard lights I could. They've been running for a couple years and the only failures I've seen have been in the solar cells (cheap off Amazon). The housings are made from 1.5 inch nominal schedule 40 PVC couplings and I had little circular PCBs made. These solar cells put out about 160mA peak so it only needs a couple hours of sunlight to fully charge. The biggest downside is there's about $20 U.S. worth of super-caps in one light :( I'm interested to hear about these new CDA hybrid super-caps though, because they might let me get better performance/value out of my current design. I'm going to have to give them a try.

[@fortheregm1249]

First time in my life I hear "killo farad"

[@whatthefunction9140]

Just wait until we have flux capacitors, then you will see some serious shiit

[@renaissanceman5847]

@@whatthefunction9140 whoa, that's heavy!

[@AlexKarasev]

I shorted a four farad as a kid. It was pretty smartly designed accounting for someone just like me, because it'd exploded out the other end - which is how I still have my eyes typing this in.

[@rimmersbryggeri]

I think these are actually batteries, and not capacitors. BigClive did a video on them som time back. They just call them capcitors because of the package type. Expressing the value in farad sounds much more impressive than doing it in maH

[@JulianIlett]

The discharge 'curve' is a straight line though.

[@antonnym214]

I just found you and love your channel! I have always been interested in Supercapacitors for their cycle life, and this is very cool idea, this hybrid. Your presentation is not only hyper-interesting, but expertly presented. I subscribed immediately. Can't wait for more. All good wishes.

[@gregvanpaassen]

I guess these could be used for dash cams, but most often one buys a "hard wire kit" which connects to the car's 12V battery via a cutout that operates around 12.6V, preventing the battery being completely discharged. Some brands offer lithium batteries as the "vehicle off" supply instead. These'd be very useful for remote outdoor IoT sensors or actuators (say a self resetting rat trap), or trail cameras though, with a small PV panel. Especially in places where it gets cold or very hot. 30,000 daily cycles is an eighty year life! That's what I call "set and forget".

[@nevilenobody606]

The data sheet on Julian's desk shows a max temp rating of 65-85C. Depending on where you are car interiors can get up to 70C so perhaps still not a replacement for supercaps?

[@GnuReligion]

Fun to think about designing things like durable remote sensors, that recharge with wind or solar, and use LoRa to occasionally phone home.

[@gregvanpaassen]

@@GnuReligion Really useful on farms, monitoring soil temperature and moisture, waterway parameters like water clarity, pumps and tanks, fence gates, and much more.

[@dziadek_gruz]

afaik highend industrial ssds use such supercapacitors in a failsafe situation so that the nand could finish writting the pending data somewhat safely in case of power failure

[@M4T1]

⁠@@nevilenobody606 70 Celsius degrees inside a car? Near a vulkan or something?

[@Mack_Dingo]

saw a 2500F 2.5V cap the other day and it was literally the size of a tall-boy can.

[@diylithiumguy]

I have some that are 3400F, which should be the largest as of now. They're large, for sure!

[@AnnaVannieuwenhuyse]

"And don't do that. Why would you do *that*?" Well, they in fact are referring to chucking them all together in a big bowl where they can freely short each other out.

[@G1ZQCArtwork]

I know someone who routinely stored his fully charged 18650 cells for his torch in a plastic box amongst many other metal stuff, including bits of fine metal chain jewelry and rings.

[@BRUXXUS]

How am I supposed to hand them out to trick-or-treaters if not in a big bowl?

[@AnnaVannieuwenhuyse]

@@G1ZQCArtwork they be the people giving other responsible users and keepers of such batteries a bad rep when they melt their jewels off. 🫠

[@MattOGormanSmith]

I thought it was a ban on using them in Free Zero Point Energy Harvester circuits.

[@gcewing]

"Don't cross the legs." "Why not?" "It would be bad."

[@ManyHeavens42]

Freecharge is not a give me, they have to, A Beautiful thing to Behold 💗

[@michaelhawthorne8696]

I'm struggling with the idea that you said the Anode is Negative and the Cathode is Positive. You then connect an LED to the Caps and clearly show the Cathode of the LED connected to the Negative lead of the Cap. Am I missing something here?

[@hoofheartedicemelted296]

Downloaded, read and printed your free pdf regarding your battery charger sir. Fascinating read. Thank you sir. I had no idea you uploaded KZbin videos. Excellent sir, keep up the good work.

[@gags730]

What are they being used in?

[@SixOhFive]

@@gags730uranium enrichment

[@Milkybar3320011]

A bank of Lion cells would need a charge controller, would the same apply to these hybrid caps?

[@dennisford2000]

I would.caps can explode, lithiated explosions????

[@kennedy67951]

Very nice demonstration of this product. Thanks for sharing.😊

[@kevinroberts781]

It's basically a battery people will use as a capacitor and end up ruining in 1 week.

[@_droid]

Maybe but this seems more like a niche product targeting special applications. They're an order of magnitude more expensive per capacity than a high quality lithium ion. Hopefully if you're spending that kind of money you know what you're doing.

[@anders4u222]

I thought anode is the positive one..

[@DarkAttack14]

Cathode, for example standard AA batteries.. The positive is the cathode and the negative is the anode. This does switch when charging vs not

[@courier11sec]

Cathode is positive. Easy way to remember is cats are good.

[@greenerell484]

It depends on whether you are charging or discharging

[@courier11sec]

@greenerell484 with all due respect, cats are good no matter what you're doing.

[@gags730]

@@courier11sec Yep... I was first introduced to the kitty when I was 16 and she let me play with hers. Been a lover ever since! Sometimes I feel like my wife and her kitty can control my behavior. My Father warned me only play with one kitty at a time. He said if the woman finds out that you were playing with another kitty that they can literally become feral in an instance and act wild, biting and clawing. If you survive, then you have to promise not to even look at other kitties.

[@scrampker]

I could imagine a scenario where it makes sense to use these hybrids as a buffer for a much larger battery for both charging and discharging. IE regenerative braking perhaps. The 30,000 cycles has me intrigued. If we consider that these are roughly 1/10th as energy dense, that means we'd need about $10 for the same storage as an 18650 cell that costs $3. So about 3x the cost, 10x the size, but would essentially last forever. I could see these being very useful for some sort of off-grid workshop with big equipment. Using some sort of smart charging/pass-through, perhaps combine with LTO batteries for the bulk of the storage.

[@lint2023]

Interesting. I guess they should have discharge protection IC's produced at some point.

[@TheBodgybrothers]

You can use a lithium ion battery low voltage cutoff. Like a dw01.

[@martinlintzgy1361]

Protection must be added externally.

[@MattOGormanSmith]

My first Tandy meter had 2mm banana plugs. it was a shame nothing else did at the time. The only real advantage of 4mm is you can see them from the back of the class

[@Neovo.Geesink]

Wow, That Notecard is Clearly readable, even for a visually impaired like me. :-) Used te Perfect font!! Also good explanation about the differences and workings of them.

[@ccshello1]

Julian, AL142 is FP6291 Last 3-digit reflects xyy X = year YY = lot So 142 is 2021 lot #42.

[@LeeSurber]

That would be a killer solution for a home solar/wind system..!! Big C rating for large dynamic loads is the way to go..!! You can keep your bank size small and still have reserve power for a few hrs or more (with load shedding)..!! I built a custom 3kw AC charger to take over when there's no solar or wind.. It also carries the loads at night..

[@walsakaluk1584]

Used in remote sensing, telemetry backup, essential control backup. Lets you turn something back on remotely if it's been turned off remotely. Keeps ears and little blue lights turned.

[@courier11sec]

I'm not at all used to seeing small capacitors like this rate in other than microfarads that just seems massive but I have at best a hobby level understanding of these things.

[@RobinHilton22367]

If they shouldn't be discharged below 2.5v then why don't they have a built in protection circuit?

[@TooSlowTube]

Maybe it's to avoid self discharge. Li batteries I've had with a protection circuit all self destructed after not being used for a while - typically swelling up and going completely flat. Bare cells can last for years without being used. They no doubt degrade but they don't become totally useless like the ones with protection circuits do.

[@gogolander]

do you have any tips on balancers for charging and discharging a string of these beauties?

[@BRUXXUS]

Kind of interesting caps, but I can't think of any practical application for one. When you need to add a bunch of support and protection circuitry just for a capacitor, might as well just use a battery. 🤔

[@frankowalker4662]

I was thinking the same. It doesn't have built in cut off.

[@paradiselost9946]

even more devices spontaneously catching on fire when left in a drawer or thrown in the bin... YAY!!!! i also doubt the construction allows for the same type of discharge/recharge cycling a well constructed "pulse" type capacitor can achieve... along with all this capacitance, what sort of parasitic INDUCTANCE do they have?

[@jerrydemas2020]

Would be perfect to power a wireless outdoor thermometer with a small PV array to recharge in the daylight.

[@w6wdh]

These are useful for USB powered devices that need more peak power than USB provides. I made a high voltage tester that charged a 5 Farad supercapacitor from USB to make a measurement. The 5F supercapacitor was barely large enough. I wish I’d had one of these Li-ion supercapacitors instead.

[@andyspoo2]

I would say the high number or charge/discharge rates and the temp ranges make it ideal for use on an outdoor weather monitor with a solar charger. You could leave it outside for years.

[@therealjammit]

A few years ago there was a YT channel on super capacitors (I forget which one) where one of the commenters mentioned they would want to see when the caps have as much energy storage as a lithium ion battery. I responded with the future super cap will probably be a mix of capacitor and battery.

[@uiopuiop3472]

i wish that hybrid caps were liked by the entity. i will check on that soon tho

[@gags730]

You nailed that... Next time I hope the premonition is the lottery hahah

[@aivkara]

So I'm wondering whether they follow standard capacitor theory, when connecting in series or parallel? And if in series, would they need a BMS to balance the cap's voltages? I would imagine so, due to the 2.5v lower limit

[@diylithiumguy]

yes, and yes.

[@luxmonday]

"they don't shoot out flames"... color me skeptical, but this very much looks like adding a Li-ion cell to a design without a protection circuit... If you have a single component fault in your circuit (Vreg dies and applies 12V to one of these, or a downstream component fails shorted) will these become unsafe? Is your product now a "battery" if you design one of these in? Do you now have to meet UN3480 before shipping?

[@raymondo737]

There is a similar alternative - Nichicon SLB (LTO battery) - but have a lower voltage range.

[@Eratas1]

Could be used in latching relay circuit to delatch relay after power is removed.

[@EsotericArctos]

Some of those mobile phone holders that have motorised clamps are advertised as having "super capacitor" to allow the arms to open or close a few times after the ignition/accessory power is off. Another use for them.

[@JoeCdaYT]

I can see these being used on thermostats with the caveat that there must be voltage supplied to it so that during a power outage it keeps the settings. Then at the same time while there is no call for heat or cooling it charges the cap back up and then a run can happen just off the capacitor. I may get some to experiment with for this purpose.

[@OlivierCR]

I bet is super fun to touch the leads when they are fully charged

[@TheTubejunky]

These might be great for some lidmotor creations!

[@waitingonmarc]

So I could connect this directly to my 5v solar panel that is powering my little water pump. The water pump stops working around 3v and only works in direct sun but with the LSC between the two it would theoretically work during cloudy days.

[@BRUXXUS]

I was sort of thinking of an application like that, where no extra protection circuits are needed because the charge and discharge completely fit within the range. 🤔

[@XEONvE]

why is your led blinking when directly connected to the supercaps? special leds or just video refresh rate issue?

[@JesusElectrotecnia]

Why diodes are flashing instead of solid brightness?

[@PaulG.x]

They are flashing LEDs , they have integrated flasher circuitry

[@JesusElectrotecnia]

@PaulG.x thanks!

[@rilosvideos877]

Why are the leds blinking/flashing when connecting them to the caps? They should glow permanently, shouldn't they?

[@tactileslut]

There's a chip inside the LED's molding, as well as a current limiter. Radio Shack used to sell them.

[@lyfandeth]

Not all LEDs are on/off. You can get many that are internally designed to blink, or cycle through several colors. Or blink two alternating colors. All done internally.

[@izzzzzz6]

Great stuff Julian. Wouldn't expect anything less... 3 or 4 of those for 1Ah not bad.

[@Phoenix84118]

That one icon at 8:29, "why would you do that", I took to mean don't place it in a pile with other components (like a storage drawer).

[@Martin-DL]

Great and very interesting video. Thanks for that. Do you also have details about the power module and measurement module?

[@JulianIlett]

Thanks Martin. I'll add links for the ZK-SK40 PSU and the DT20 Voltage and Current module to the description before I publish the video. Cheers.

[@marwerno]

8:20 I guess they could have just sad: Do not short out the legs... as for 8:29 I guess this is to show the situation when you put several capacitors loosely in one container/ box and they might touch each other?

[@4DCResinSmoker]

Can these be used to power a quad-copter ?

[@marcfruchtman9473]

Really cool info. Thanks for the video. Honestly, I am having trouble thinking of good applications for these given their "don't discharge" risk of failure when discharged completely. Hard to say how many times it can handle this before failing, but they put it in the warning so that probably means that you can't do it without risk. Ok, they do charge fast, but what kind of application requires massive charge speeds with very low total capacity vs just having a Lithium battery?

[@madwolf-us4sc]

You will need an auto shutoff in the circuit to use this if not it will discharge below 2.5V if left unattended

[@CornishMiner]

Excellent video. Very interesting products. 👍

[@amorphuc]

Very interesting. Thank you for this content. Obviously not a replacement for Lion batteries for capacity and even D ratings maybe but... seems to have a place in a lot of applications due to discharge and recharge dynamics as well as lifespan. Love the kit you are doing testing with. Cheers! Oh, I'm a total newb by the way. If I only had a percent of your knowledge on this stuff! Just interested in learning.

[@amorphuc]

Also, thanks for the links! 🙂

[@greenaum]

To protect against over-discharge, could you get a zener diode driving the base of a simple transistor? So when the voltage isn't enough to overcome the zener, the transistor just cuts off? Stick a resistor inline with the diode, too. Would that simple solution work? If it's bipolar, I suppose you'd have to account for it's own base-emitter voltage drop too of 0.6V.

[@humidbeing]

You've just described a linear regulator.

[@rilosvideos877]

Very interesting little caps/batteries. They are still rather expensive tough but maybe advantegous in some applications 🙂 Could be a game changer when these are further improved with more capacity and charge time and price ;-)

[@PrabhakarSharma-qg4ov]

Very nice information Great wark Excellent Video Very good 👍

[@TheElectronicDilettante]

Was the bottom right image of the multiple capacitors mingling their leads together a warning against connecting them in series or parallel??

[@johanslabbert2869]

Yes

[@JulianIlett]

No. It just means don't store them loose in a component drawer with lots of other components.

[@dantronics1682]

Quick question. If the voltage of the cap doesnt go to 0v but stop at 2.5v shouldnt the calc be Q = max v -min v * C?

[@Aim54Delta]

I would have to buy some and run some tests to confirm their properties, but the way I interpret it, you would take the energy stored at vmax minus energy stored at 2.5v. because the energy in the capacitor is proportional to a square of the voltage, a discharge of 1.5 volts is not equal across the charge curve of the capacitor.

[@FellaMegaOld]

Are you ever going to parallel those 25A bucks ?

[@alf3071]

can this be used to charge an electric car while driving on the highway

[@QUADBOYification]

Maybe these are useful in buffering windturbine power generation fluctuations. Quickly charging a bank of these and if wind drops it takes over the 12/24/48v output. 30.000 cycles might be just enough to last you a year if not longer. building might not as simple and costly, any ideas?

[@GiesbertNijhuis]

A blinking LED and no resistor?? How what is that?

[@effedrien]

There is electronics inside to switch it on and off, these use higher voltage like 5v and resistor is built in

[@jcwdenton]

They would be perfect for garden solar torches.

[@Howie672]

1:21 three halves?

[@LeicaM11]

Killo Farad sounds like Terra Byte.😊 Thank you, for showing, anyway.

[@kentonian]

Home energy storage could be interesting if cost per kWh can lower than traditional li-on. The cycle life would be very handy, maybe it could be used every day for 30 years with little degradation.

[@steadyfield]

Can you perform some cycle life test?

[@JulianIlett]

How many cycles?

[@Elyon113]

I bet an electric car made with these would be poggers

[@UpLateGeek]

I am curious how tolerant of overdischarge these are. The standard DW01 cell protection IC has an overdischarge threshold of 2.4V, which may be OK if that 2.5V min discharge voltage is a little conservative. Otherwise, most other cell protection ICs state their overdischarge threshold as 2.5V, so perhaps it would be better to go with one of those rather than a DW01.

[@jaro6985]

You wouldn't want to use DW01 since it doesn't cutoff until 4.25V. Though there are variants that have higher/lower cutoffs that you could search for.

[@BRUXXUS]

DW01 style ICs also require charge and discharge MOSFETS to turn off, so if you wanted to be able to charge or discharge one of these at high rates, you'd need some seriously high current MOSFETS. I guess if no high current is needed in the application, it wouldn't be bad.

[@JulianIlett]

Well they've survived discharge to about half a volt, but I may have shortened their life.

[@renaissanceman5847]

@0:59 they are half Capacitor, half Supercapacitor and half battery ...dude thats 3 halves...

[@jcwdenton]

Try to guess which half is the biggest! :)

[@grantrennie]

I have a large selection of the supercaps and hybrid capacitors

[@thomasnewton9818]

The lithium ion super capacitors would be interesting to try for motorized rubber powder model airplanes.

[@IntenseGrid]

The 300mAh probably is due to 1) rounding and 2) the fact that battery declines in capacity faster than a hybrid capacitor/battery

[@FirstLast-vr7es]

I've often wondered how something like these (or regular supercapacitors) would work for regenerative braking. They'd very quickly soak up charge from braking, and trickle it back to the slower-charging main battery. Maybe they already do that. I dunno.

[@geauxracerx]

They don’t. Regen is being held back by going straight into the battery packs I’ve been saying the same thing for years. In fact there should be a supercap bank on both sides of the battery bank. Help take that hit under acceleration, and during regen. It’s almost like manufacturers just don’t care about battery life. Probably because they also sell replacement batteries at a huge profit

[@CosmicFurFace]

@@geauxracerx I recently read about some tiny electric car that used supercapacitors for acceleration due to it's small-size batteries. Cannot recall the source...

[@Ra-zor]

I don't define that as a capacitor, it's a battery if you can't discharge it past a certain voltage. Capacitors have no discharge limit, its part of the characteristic that defines them as a capacitor. Having said that, when they start to make these in the 5 amp range things will suddenly become very interesting!.

[@krisyoung447]

I added a 5F cap to my car audio system 20+ years ago. It is about the size of two soda cans. Remember thinking it was such a huge amount of capacitance! Well, my headlights don't dim when the bass hits...

[@gags730]

I have always used Caps in my car audio systems. Like you, started to use them because the headlights would dim when you were pushing a lot of watts. It smooths everything out. It helps a lot with not killing the charging system. Soon as you said the headlights dim made me think of this.... Listen to the Lyrics from LL Cool J 'The Boomin System' 🎶Twelve o'clock at night with your windows down Headlights blinkin' 'cause your batteries drained Armor All on your tires and a Big Gold Chain. 🎶 I will have a system in the car til the day I die! Amps are so cheap compared to the 80s and 90s... I used to pay $1 to $2 per watt back then and would fix my amps when they took a dump. One of my all-time favorite songs for Bass is from Masta Ace - Born to Roll It has a strange bass almost sounds like reversed at times. 1993 What a year at the Jersey shore LOL

[@krisyoung447]

@gags730 I'll check it out. My favorite workout for my JL Audio 10W7 and a 500/1 Amp is the opening drums in "Take No Prisoners" off of Megadeth's Rust in Peace album 1990. My amps are still fine. Had to put a new surround on the 10W7 about 2 years ago. It disintegrated at a car show. I have it in a custom box I built for a C5 Corvette. Every place told me the 10W7 wouldn't fit in a C5. Well, that was when I learned woodworking! 😀

[@normativesymbiosis3242]

Why don't these flashing LEDs need no resistor? Is the current from the capacitor low enough?

[@johnnodge4327]

Flashing LEDs have built in current limiting, so they can be used on up to 5.5V supply rails.

[@normativesymbiosis3242]

@@johnnodge4327 Thank you Sir!

[@lyfandeth]

The resistance is internal. You can find many "12 volt" LEDs designed for direct use on cars and other 12v sources.

[@martinlintzgy1361]

Often used in combination with a Bobbin-constructed lithium thionyl chloride primary battery, for a 10 year + battery supply.

[@crazysquirrel9425]

Only 30K cycles? Doesn't seem to last very long.

[@simontay4851]

30,000 is several years.

[@marcfruchtman9473]

@@simontay4851 I was wondering about that... I can't be sure that my calculations are 100% correct. If you can figure out how long it takes to charge and discharge at the rated current upto the max voltage, and down to zero, that should help with the life cycle. I was looking at the 100F version that has 0.6Amps rated current... and it seems to be 2 years if you continuously cycle the charge and discharge 100% (5Tau)... but I can't be sure.

[@lesh4357]

Wow - Cabacitors or Cabacitries !

[@edinfific2576]

Those are not capacitors. They are merely Li-ion cells dressed up as capacitors. Their minimum allowed voltage is what exposes them as a fraud. My guess is that their working temperature range and the cycle life is not what they claim, and that they are not cheap. I would say they've found a way to sell ultra-low capacity Li-ion cells (possibly old depleted ones) as "ultra-capacitors". I hope I'm wrong.

[@JulianIlett]

Datasheets don't lie. Well, not generally.

[@johnslugger]

*How fast can they charge and discharge???*

[@effedrien]

I think he said 20C, that would mean fully charged in 3 minutes. 1C is full charge in 1 hour, 2C in half hour, and so on

[@Figaro-qua]

Thank you, Julian. I really enjoyed your video. Nice to know that capacitors are so close to having the same energy density as batteries (for example, a htc1450 LTO ). Mind blowing! Try the S9V11MACMA buck/boost regulator from Pololu with adjustable voltage cut-off. They are great and still tiny. All the best.

[@skeptical_bystander]

First time I hear (and see it printed on your paper) that Anode negative and Cathode positive

[@mr.mythoclast4451]

now we need a charging circuit that follows the rating of the Cap

[@GannDolph]

good for pager and walkie talkie designs

[@thulinp]

What would be the Farads of a typical 18650? Does it even apply?

[@JulianIlett]

Farads don't really apply to batteries because their voltage rise is not linear over time at a constant current. But you can still use the Q=CV formula if you like.

[@clockworkvanhellsing372]

At 2.4Ah ( 8640As) for a voltage difference of 1,2V, it would be ~ 8640C/1,2V = 7200 F. Quite close to the caps.

[@Echinacae]

Mind you, I have no clue how this works, but shouldn't a 1000 farads at 3v be about equal to 1 watt-hour? If so, this is getting into battery territory, an 18650 has about 8 watt-hours.

[@justpresident]

Why LEDs are blinking??

[@robertpeters9438]

What about leakage current?

[@gags730]

They are putting these in those disposable rechargeable vapes. I was walking down the street and saw a vape that was run over by a car and saw that hanging out of it. The land fill is going to be full of these!

[@AnthonyClarke1965]

Great video, interested in the 2mm Clips too!

[@JulianIlett]

Thanks Anthony. I'll add some links for the 2mm banana stuff before I publish the video. Cheers.

[@AnthonyClarke1965]

@@JulianIlett Ordered, thanks!

[@fklotaloi]

Love the British accent ❤❤

[@wayne8113]

Thanks Julian 👍

[@bskull3232]

Put in short, they are fairly useless compared with modern LFP cells. Modern LFP cells can do 20C easily, modern LFP cells can do 5k~10k cycles at 1C, modern power-type LFP cells have less than 1mR@10Ah, while those CDA cells have 2mR@10Ah. Other than low temperature and being available in really small capacity, I don't see any advantages. So maybe, those are great for EDLC replacements, but that's all. I can't see them challenging true batteries even for pulse power applications. What I can see usage of this thing is in embedded systems needing more than an RTC battery. Say, a multi-core SoC with rewritable storage subsystem where the system takes more than a few hundred milliwatts to finish its current job, flush the memory, and gracefully shutdown. You might want a small solderable component in the system to support all of these while taking minimal space and still be safe by not storing too much energy to piss the TSA/IATA off.

[@gcewing]

Lack of potential for explosion and fire would seem to be a good thing for uses where you don't need a huge energy density.

[@johnnodge4327]

​@@gcewing LFP batteries don't go on fire like NMC can.

[@SebastienLIDAVET]

where to buy 20c capable LFP cell?

[@JinKee]

How much acceleration could you get out of a car entirely powered by banks of these?

[@JulianIlett]

Plenty, but the range would be a bit iffy ;)

[@CosmicFurFace]

@@JulianIlett I mentioned elsewhere about an electric car that used supercapacitors to enhance acceleration, but darned if I can find the article! It might've been the Lamborghini Sian described in an "E-Mobility Engineering" website I found...

[@JinKee]

@@JulianIlett i only need a quarter mile

[@tjlingram]

Could be used in amplifires

[@whoisntwhoisit2126]

2mm Banana's are too easy to break in a working environment is why they use 4mm.

[@johanntiu4162]

My Joule Thief supercapacitor flashlight lasts 20 minutes on one charge of a five volt 4 Farad supercapacitor. At 1.1 kilo Farad it would last around 9 days one one change 😂.

[@BRUXXUS]

I was thinking that this might be useful in a case where the minimum voltage is below the voltage drop of an LED, so it's sort of a passive protection thing.

[@CosmicFurFace]

The charge rate vs a battery would make this a nice use case...

[@gamerelated3887]

Bat Trees??? interesting. lol. just kidding. Love the video! Very informative!

[@chuckmaddison2924]

Brilliant made with 3 half's.

[@BEdmonson85]

imagine putting those through a wave soldering process lol 💥💥

[@mikemotorbike4283]

Why use these? If you are holding out for the perfect supercap which also has capacity like a battery, you can use these while you are waiting. They are 1/6th the capacity of an 18650, or 6x the size, allowing 30k cycles and freezing temp charging(?). 500mA good for unattended or remote installation; telephone pole cam wi/solar panel will last decades. Set up an Eagle nest cam, climb the tree once, install and cheer on the internet eagle chick stream forever.

[@clockworkvanhellsing372]

Regenerative breaking might also be a great use.

[@WhiteDieselShed]

@@clockworkvanhellsing372 What is the point if it's broken though?

[@clockworkvanhellsing372]

@@WhiteDieselShed I've got to stop , and do a spell check nex time.... *regen braking

[@Subgunman]

Are these used in the newer electronic vaping devices that are throw away?

[@incandescentwithrage]

No, they still use standard Li-Ion / LiPo. These are more expensive for the same capacity so there'd be no point.

[@JulianIlett]

Well, the datasheet for the LIB series does list electronic cigarettes as a possible application :)

[@incandescentwithrage]

@@JulianIlett I'm sure it does, however energy density and cost are greater considerations in the context of disposable vapes, per OPs question. I will welcome a ban of the disposables, and that's from someone who vapes. Can't go wrong with a replaceable 21700, coils, and good quality liquid that comes in at

[@JulianIlett]

Soon to be taxed. But will the duty be on the vape liquid or the hardware (including the battery)?

[@incandescentwithrage]

@@JulianIlett I hadn't heard of that - just had a search. Yeah it's the liquid - £2.20 *tax* per 10ml from 2026. The UK is becoming death by 1000 cuts. They couldn't exactly tax flat top cells. If I still live here in 2026 (doubtful), I'll just mix my own by the litre, I guess. Govt will doubtless have a surprised face when there are inevitable deaths from the general public getting even this simple task wrong.

[@stevecummins324]

Maybe have a try DIYing some capacitors? out of anodised titanium sheet, submerged in water, and inside say a length of copper pipe. The anodized layer has a high dielectric constant. Should self repair(with decreased capacitance) if over volted. Anodised layer is very thin, and has extremely high resistance...in comparasion the resistance of the water can be considered neglible. In effect separation between capacitor plate is tiny. Taken together very high capacitance for surface area. And without the usual voltage limitations of supercaps *And* it can get even more interesting.. it's a wide range variable capacitor. Adjust the water level and capacitance value changes...If capacitor is charged, it'll hold a certain amount of energy. E=C*V*V/2 let some water out of a charged capacitor. Even as capacitance drops, energy wants to stay constant so. . the voltage across the plates has to increase.

[@paradiselost9946]

the water bit is interesting as its related to coulombs, AND hydrostatics. "charge" versus "potential"... or, for the liquid itself... "volume" versus "pressure". a litre of water, a coulumb of charge, can be in a shallow bowl/large surface area, with little to no pressure/potential. that same litre in a thin vertical tube/charge concentrated on a small surface area, can reach incredible pressure/extreme potential. anyway... the anodising will be on both sides. and that isnt how an electrolytic is constructed. theyre assembled, THEN "anodised". and water is only "conductive" when it has an "electrolyte" in it, ionic flow...

[@stevecummins324]

@paradiselost9946 8mm copper pipe T with a short length of pipe. 4mm width Strip/rod of titanium fixed at one end by an epoxy plug Filled with "tap water" not distilled water. My local tap must be unusual in containing ions. current path length through water not much. Resistance across device measured before anodising of under 10kOhm. I'd agree far from a *perfect* conductor, and will contribute to ESR of cap, but it is small compared to resistance of above 10Mohm after anodising with diet Pepsi! Ie 0.1% The titanium rod becomes the positive connection, the conductor to the + plate, support for the + plate, and where surface in contact with water the dielectric. The copper pipe t... the negative electrical terminal.

[@audionoob2174]

They are all on sale 99c each

[@Wtfinc]

These might be perfect for animal tracking radios.