Testing more 18650 Li-ion cells (REAL vs. FAKE)
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- čas přidán 26. 04. 2018
- Today I tested even more of 3.7V 18650 Li-ion batteries from Ebay and explained how to tell the real ones from the fake ones. 18650 Li-ion cells that weigh under 40g tend to have a low capacity. The cells marked over 3500mAh are surely fake and actually are about 500mAh only. Cells with spelling errors also tend to be fake. Button top batteries are way more likely to be fake than the flat top ones. Suspiciously cheap cells are usually fake or recycled from e-waste (rewrapped cells salvaged from old laptops or other devices). Marks from previous spot welds may be covered using metal circles. Recycled cells may range from almost unused to totally worn out. Fake batteries may claim a protection they don't have.
List of all 18650 Li-ion cells I've tested:
danyk.cz/test18650_en.html
You can support me on Patreon:
/ diodegonewild
My Instagram:
/ savage_danyk - Věda a technologie
Naming a battery TrustFire is like naming a car DefinitelyCrash
Or naming your bank Robabank lol
🤣🤣🤣
🤣🤣🤣
I Trust you to burn my house down.
A bit late but awkward this specific battery is Real
I like your videos. Both informative and entertaining. Keep up the good work.
Cheers,
KC
One apparently also now has to be careful about relying on cell weight. I've read of some manufacturers packing sand or other compounds in low-capacity and/or counterfeit 18650 cells to make them appear heavier and thus closer to the expected weight for a higher-capacity cell.
3:20 Do not disassemble the battery or put the battery into fire
The battery must be charged according to the charging requirements
Do not place the battery below 2.75V
Lol, love the magcian's presenting voice. Sound like The Count, I keep waiting for the, "And today's show is a brrrought to you by the number 3.7! Ahahaha And the letter V! ahahaha" lol
good work, especially the DIY battery discharge box which is microprocessor based.
it's things like this that are the reason I never trust any batteries. I just power all of my electronics using three hundred thousand potato batteries instead.
I grow them in my basement.
Hi, great stuff. Also did you make any videos about that battery tester? Would love to see it gets built or at least can we have a schematics for it?
Nice video. What is the best chipest by 18650 battery?
do you have any you can share about how to build a battery tester like you have in this video?
Thank you for the tests! It sucks indeed those fake batteries are sold!
6:54
"DoublePow" ... LOL! Double the POW! (BANG!)
Hello,
Is there any good and cheap battery capacity tester on the market?
The batteries will last longer in long term storage at about 3.5 v. This is less that full capacity. At full capacity they degrade faster. According to manufacturer literature. This rule is valid regardless of the size capacity of the battery. Before use, after long term storage, the batteries should be topped off to 3.82 volts.
The 3.8V is good when a person is recharging and using the batteries on a regular basis.
thank u for more clarification pls provide the circuit of jig made for testing batteries
Do 18650 flat top batterys work in devices with 18650 button top. Can you use any of the two types of 18650 in most devices ?
Will you please teardown a charger like iMax B6 or Accucel - 6? And explain how it works?
well I've been using a Turnigy Accucel for about 4 years now and it's still been OK :). Not done a teardown on it as I don't want to break it! :p
2 18650 3000mAh ebay cells arrived here today. One tested at 767mAh and the other at 778mAh. Sad excuses for batteries. Thanks for continuing to test cheap ebay cells.
hello dog :D
the dog is not so curious about electronics as the cat. cat always wants to know about the experiment being done. I think dog is just waiting for its dinner or go for a walk.
I've enjoyed following this series. You start wondering with the 25kg/500mHa fakes if there is a single factory that makes those specifically to be sold on ebay under a myriad of fake brand names.
the 25g/500mAh batteries are (or were) made at a price point and were designed to be poor quality, with almost no material inside - hence the 500mAh only.
Please show us how you made the discharger.
can I use this diy charger cellphone? 18650 3.v 2600mah
I guess you can trust fire?
Well I trust fire to burn me.
Funny enough, I bought an 18650 online with no description for 5$ and when I got it it said its capacity is 75,000 mah, in my mind I was like, WTF?????
So I weighed it after I saw this video and my battery was 12.5 grams, I’m guessing that’s meaning 250 mah, the lesson here is, don’t buy HUGE UNBELIEVABLE capacity batteries on wish.
Edit: when I charged it, it literally took 15 minutes for a full “75,000 mah”charge. What bullshit, lol.
@@zenberryflood For such a low weight, it was probably a really tiny battery inside (like, 200mAh or less) and the casing.
There are some examples whereby the case is filled with sand (as well as a tiny battery), or if there is just not enough material for any decent capacity (like how the 500mAh cells are built to).
Another awesome video review of battery’s
Excellent video. Thank you so much
Yes you are right, the ones advertised with capacity amounts greater than about 3500mAh are probably fake batteries. No manufacturer has gone above this amount i don't think! mainly due to cell size Limitations.
is there a video on your battery discharger? I'd like to see how its built!!! great video..
not a video yet, but a webpage:
danyk.cz/avr_aku_en.html
What about the claimed protection circuits? Did any of these batteries actually have one?
No
5:50 - I have 6 batteries that look just like that one! Except they're "Outlite" branded and claim to have 3600mAh capacity. I just weighed them and they come in around 44g, same as my Panasonic 2550mAh 18650's.
If i test my 18650 batteries. Should i charge it to 4.2v and discharge to 3v?
It's kind of funny they are marked mAh when they are above 1K m.. I mean it could just say 2.5Ah intead of 2500mAh. It's like if I live 600 meters from the nearest store, I'd go around telling people I had to travel 600000 millimeters to get milk.
Would be interesting to also test the high current capability of the 40A Trustfire. I dont believe it can take the 40 A for a minute! Maybe 20 Amps.
About the best storage voltage for Liion batteries - to my opinion its around 3.6 V, not 3.82. It also can be 3.5 ... 3.7 with no big difference in storage behavior.
You just should not store them fully loaded to 4.2 V as they suffer the most, when fully loaded. 3.8 V is still 60-70% fully charged, its better to keep the charge lower for longer storage.
You should just care about the voltage should not drop below 3.0 volts as this may start to demage the chemistry. The lowest is 2.5V - afterwards there will be permanent damage, but its
better to keep 3.0 volts as lowest discharge. It also depends on the actual chemistry - most likely LiMnCo in the 18650.
You are correct. The batteries will last longer in long term storage at about 3.5 v. This is less that full capacity. At full capacity they degrade faster. According to manufacturer literature. This rule is valid regardless of the size capacity of the battery. Before use, after long term storage, the batteries should be topped off to 3.82 volts.
The 3.8V is good when a person is recharging and using the batteries on a regular basis.
Great and super-informative video. Nice you weighed them and specified the proper storage voltage. Very helpful for do-it-yourselfers. Btw your dog is Awesome! !!
Thanks for sharing!
keep up ur channel man...ur doing gud stuff..more power to ur channel
those fake 18650 battery contain a smaller battery with 900/950 mAh capacity and some sand to fill the empty space
Could you make video how to make this battery analiser?
Video may come later.... At this point I only have a webpage about it:
danyk.cz/avr_aku_en.html
Informative video..your voice over is serious meme potential.
I have a question that is somewhat related to this. I have a tool that has 2 lithium ion cells in it and the tool says 7.2 volts, which is fine, that's the 2 cells together. But the charger for it says that it's output is 9 volts, which I know is also fine to charge those. But when I test the output with my multimeter it says 15 volts. I know they aren't always accurate with what they say, but that's way off. What would be the reason for that?
If the charger isn't loaded (connected to the tool) when you test it, the voltage will be significantly higher. You always test output voltage of a transformer or power supply with a load. Also, the tool almost certainly has voltage regulation circuitry that adjusts the charging voltage to conditions.
trust fire= trust me you will have fire!
James stranger haha I laugh all time...
Ultrafire= self explanatory
Surefire = it's absolutely guaranteed to cause fire, and we refund you if it it doesn't self combust within 30 days
Spiderfire = when you try to recharge it, a giant fire tarantula comes out of the battery and bites you
Ultrofite = we tried to copy ultrafire, but we failed miserably by making slightly better batteries than them
SingFire = the flames that are bursting out of the battery make a whistling sound while your precious gadget is burned
MarsFire = Sponsored by the CNSA and will be used on their next mission on Mars as portable heaters
UranusFire = can be used to set the planet Uranus on fire. No warranty. Point away from face.
Bestfire = We give you another battery for free if it hasn't combusted your expensive gadget properly.
RichFire = When the battery bursts into flames, these will be composed of pure gold.
LusteFire, TangFire, FandyFire, Kinfire = plz stop
It's unbelievable how many [something]Fire batteries there are out there, and it's slightly less unbelievable that all of them are total garbage :)
All of the above "brands" are real :D
Genuine TrustFire battery's are actually quite good.
MrOpenGL good one! I try sticking to the LG Samsung, Panasonic brand. My house just burnt down a couple years ago. " nothing to do with batteries" I have one of the trust fire that I do not use. It comes in at just under 400mah. I don't need ANYMORE fires!
Joking aside, with that little energy those batteries store (My "UltroFite" was supposed to be 4200 mAh, yeah right, it really is only 200 mAh...), I think the fireball wouldn't be such a major thing :D
What you say in the description is wrong, 3600mAh is still possible!
"Even though I don't trust any fire." LMAO
can you make a video of which 18650 batteries are the best in terms of value?
What is your intended purpose for the batteries?
i have 1000pcs of HIGHSTAR isr18650 3.7V and 2000mah.. does somebody have any data about this cell? because i need to testing them.
Clearly the high capacity batteries have helium as the special ingredient to give them the extra capacity
Those cast noos kick ass
Thanks so much for the listing of all of those 18650 batteries because I've only purchased 2 from Ebay, & of coarse they were fake. At least now I have some much needed info before purchasing any more thanks to you. Keep up the good work my friend. Do you have a video of where you built your battery tester at??? If so could you please send me the link to it here? Thank you very much, Tom.
I don't have a video about the tester, but I have a webpage about it:
danyk.cz/avr_aku_en.html
Thank you so very much.
This is so cool how you made this.
Plánuješ začať nahrávať aj vo vyžšej kvalite než 720p?
Your dog is adorable. Also, nice video :)
Your speaking style is good to listen :) by the way where is ur kitty :P
Silent Poetry the cat has gone ballistic !!!
boom!!!!!!!!!!!!
stop asking such disrespectful and personal questions, this is a clean channel.
Please link to buy
you are the man of facts . good video
i would have liked to see that trust fire battery being discharged at 40A. I wonder it it will exlplode. Usually those things will only do 5-10 amps at most, maybe a little more for a really short time. i wonder what happens to that battery with 40A.
If that does actually work you could use something like 4 of those in parallel for spotwelding.
It probably could supply 40A, but the question is how long.
Also the voltage may drop close to zero at such current. I have a feeling that the current rating on some of those cells is actually its short circuit current.
Well, spotwelding is basically a short circuit to be fair. But yeah, it would probably be a question of how long.
Hi ☺ i really love watching your videos. Will you show us how you made your own diy battery tester for li ion cells please...
A video may be coming.... at this poing I only have a webpage where I describe how to build it
danyk.cz/avr_aku_en.html
very helpful, thank you
I love the accent its nice to listen to
I think so too 😆
Stretch woooooooooooooooooooooords!
For me it sounds like a... constant joke. :D
I'm guessing that a super strong Czech accent. I can recognize those. I have Czech friends
I'm thinking exactly the opposite. It's almost impossible to concentrate on the video with that accent!!!!!
So 100% capacity is from 3.0V to 4.2V?
My RC charger suggests 3.2V /4.1V for discharge/charge
yes that is better for the battery life.
I was taking out a battery from a small power bank, and we forgot why we don't used it. Because the battery was super bad. The ICR18650 D1 battery claims, that has a capacity of 3000 mAh. I measured it, and it was just 125 mAh!😬 The battery was just 6 years old.
Simply outstanding!👍👍👍
What Is The Best Battery For Vape??? Can SomeOne Help Me Out Here???
Nice video but what about the claim of 40A discharge rate? Are you going to check that too?
It probably can supply 40A, but the question is how long :). Additionally, the voltage of the battery may drop close to 0V at such current....
DiodeGoneWild fair enough!
Danyk ! You cant hide with that voice :D
Ahoj, chtěl bych tě poprosit, zda-li nemáš někde schéma na ten tvůj domácí tester. Děkuji
tady:
danyk.cz/avr_aku.html
DiodeGoneWild Dêkuji!
Thumbs up not really for the quite long-winded video, but a BIG thumbs up for the great comparison table!
2:50 *RIP Engrish* 😂👌
9:43 cool *dog!*
idk did they mean "Sheer-life"?
Good video thanks for
Thanks for contributing basically those fake battery are the same you just add new name and done.
zdravím ťa, viem že si z CZ tak nebudem písať anglicky... nedavno som si poskladal a naprogramoval podobný tester na baterky ale s arduinom, inšpiroval som sa tvojim z webu a videom od great scott (constant current load) je to frankenstien medzi týmito dvoma, no časom plánujem ovladanie prúdu takým istým spôsobom ako ty (PWM), k veci, všetko funguje ako má, je tam bočnik ktorý sníma prúd, je tam odporový delič na napätie, všetko doladené potenciometrami na hodnoty multimetra... problem je ten že na baterke po dokončení testu stúpne napätie a je schopná pokračovať v teste pričom meranie vyzera asi takto : 1.pokus dá 1900mAh po 5min dam pokračovať v teste a dá mi dalších 100mAh atď. (ano mam perpetum mobile :D ) vždy mam nastavený cuttoff voltage na 3.00V a prúd na 0,5A ... teraz neviem či mam v testoch pokračovať dokedy z nej nevytrepem všetkú energiu alebo mam brať iba tú prvú hodnotu, t.j.: 1900mAh ? za pomoc vopred ďakujem :) taktiež za skvele náučné videa a perfektný web, človek sa od teba veľa naučí :)
3,35V is the voltage alot of manufacturer use for NEW Batteries. This Voltage ist perfectly ok as there is no BMS that could drain the Batterie.
I have a 20ah high gain power bank and it has 5 4ah lithium tubes that discharge at 4volts 1 amp. You can tell the difference from any fake 4ah tubes because the real ones weigh 750 grams and the games are 300grams at only 1885 mah
Samsung 25R rebranded as Trustfire?
Sir can i charge a protected liion battery directly with a 5v supply.
No, you can't. The protection only can disconnect the battery in some fault condition, but it can't regulate the current.
DiodeGoneWild then how some youtube experts charge an unprotected cell directly using their bench power supply keeping the voltage at 4.2 or 4.4v directly.
You can charge a Li-ion cell using a bench power supply if the power supply has a current limitation and the voltage is set to no more than 4.2V.
Very very thank U sir...
nice test
All those battries they are no longer available i checked them on ebay n amozone, pls make a new video with new available battries
Is it still possible to get these things shipped to EU countries? The last time I ordered 18650s and some other batteries they just don't arrive so I'm thinking at some point someone notices them and stops them from being shipped, I could use some cheap cells because the capacity is not really an issue and the good ones are ridiculously expensive
I'll try to get some. I mean basically you can get them for free endlessly. For what applications do you use them?
@@deDANIEL11609 I have a few devices that use them, also I could refurbish the battery pack for one of my old laptops since it's still one of the old fatter laptops that had a bunch of 18650s inside the battery
I'm just thinking that maybe they tightened something recently because a lot of listings wont ship to the EU anymore. Obviously it's not a big loss because eBay always refunds them but I've tried twice and also ordered a replacement battery for a PSP and PS3 controller but I had to refund every single one of those 4 times
There's usually some chinese sellers with european warehouses with slightly higher costs so I wonder if they have some batteries as I've never had problems inside the EU
@@oswith971 i found these fake 9900mah cells sold as "quality" items from germany directly... i mean even if you get them you should be able to refund them. Ive ordererd now 2x "original" panasonic 3400mah, for 2,50 each dont think theyre original. lets see if they get shipped or not.
Dog be like: Oh man, not again!
Informative video keep it up
Would you say these fake marking battery's are made with 100% Criminal Intent?
If so this should be investigated further do you think?
What are the brands of good batteries ?
Panasonic, Samsung for example
6:22 No to vidím, že to je falzifikát, mám 12V batériu, ktorá stála cca. 15€ a má kapacitu 9,8Ah (9800mAh). Nie je možné aby monočlánok mal vyššiu kapacitu ako 3S4P batéria...
my rechargeable doller store fan has a generic 18650 type battery that is 3.7V 1500 mAh
Be careful when they promise 3000mAh or higher. Its already a red flag. Most Branded Lithium Batteries have around 2000mAH to 2800mAh specially those used in Cordless Power Tools. I have opened most of Ryobi, Workzone, Ozito and AEG battery packs and they have these values.
Your doggo is so cute :3 hehe I love dogs xD
I go with what I saw in another video- fake batteries will be less than 40 mg. If you don’t have a scale tap together and you can hear by density. Of course common sense says be leery from the higher Rated over 3500mAh for the 18650 size battery
Batteries with capacity over 2800 mAh are usually fake and also usually worse than the ones with lower capacity, like a battery with 6500 mAh had just 550 mAh.
Not true. There are legit 3500 mAh batteries out there. Typically their output current is low, though. The Sony VTC-6 is 3000 mAh and puts out 20A safely. It is the best 18650 on the market if you need a high drain battery.
7:07 I have the exact same multimeter
I bought this for almost 9$
Chinese translate：Do not disassemble or burn it.And charge it properly.Do not charge it less than 2.7volts.
You should measure the weight of the batteries before and after they were discharged :-) there should be a difference, because depleted, they dont have any more electrons left (or just few pieces as the residual charge)...
Elektrony se pohybujou jen uvnitř baterie. Tím se hmotnost nezmění. Relativistická změna hmotnosti u tý nejlepší z těch tří, která má 9Wh, by byla 0.00000000036 gramu. Až seženu váhu, která měří do aspoň 50g s přesností na 10 nebo 11 desetinných míst, tak to můžu ověřit :). Ale myslím, že váha tý baterie se mnohem víc změní, když na ní sáhnu. Nějaký atomy se z povrchu obrousej a nějaký atomy kůže na ní přibydou :D. Myslím, že se ta váha baterie změní víc dokonce i když na ní jen dejchnu nebo možná jen když se na ní podívám. :)
DiodeGoneWild in English please, I think your reply is interesting.
alfagulf our DiodeGoneWild is just writting about the fact, that he (and other people) is like a snake: loosing skin, but unlikely is not leaving it in one part on some place, but per-partes leaving it on warious places (e.g. batteries) making the surrounding objects in the natural habitat of the "Man" heavier (some analogy of a dog marking his territory - therefore the 🐕 in the shot).
Haven't you heard? Russia has been interfering in the electrons lately.
Great video, like it, also have a few 9000 mAh fakes.
Ther is some rezistrrrrr in itttttt
That IMR battery uses lithium-manganese chemistry, which allows very high disharge current. Cell with "normal" chemistry would burn down with the current IMR cell can provide. It's also much safer chemistry and often doesn't have protective circuit. Designing high current protective circuit is also very difficult considering the small space available.
Where can I buy some good ones?
If you are in USA, check these:
www.fenix-store.com/fenix-arbl18-high-capacity-18650-battery-3500mah/
Very expensive but very good quality.
excelente amigo
You should trust the trustfire battery
love your dog.
Love your english
I like ur accent. How u flip ur rs. I sometimes roll mine, even though my only language is English (US)
Those TrustFire batteries have all the warnings but the most important one: Do not insert the battery in mouth or other body cavities - burns will result. They pack a wallop to sensitive mucous membranes. OUCH!
This type of warnings is more typical for USA products :). Because of the intelligence of the USA people...
I had one that promised a "low recurring operational cist". I did not want this feature.
I also have this battery in my collection :) The red one:
danyk.cz/test18650_en.html
DiodeGoneWild :) The Chinglish is always amusing. Sites like this do not help m.bukalapak.com/p/elektronik/komponen-elektronik/2mc4fm-jual-battery-wrap-18650-ultrafire-pvc-sleeve-plastik-baterai-pelindung-batere
The real capacity of Chinese batteries is advertising capacity divided with 10 😂
Sir, I know English is not your first language, but if you talk a little slower it would help U.S. English speakers can understand you! Other than that, you have some great information. I appreciate that and commend you. I wish we could get sellers like this to be held accountable! Keep up the good work!!!
Sony, LG, and Samsung (and maybe Sanyo) all make 3000 mAh 18650's that can put out 20A safely. The problem is finding real ones as none of these companies sell loose batteries and keep tight controls on where their batteries go.
Bottom line: If it's not made by one of those companies, you don't want it. (Panasonic only makes low drain batteries which are fine for low amp applications).
John Smith
Does this means I cannot use Panasonic for a DIY Powerbank?
I have 5 Panasonic Violet 18650 which I plan to utilise as replacement Powerbank batteries