Clever but Dangerous 18650 Li-Ion Cell Charger (for $1)
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- Опубликовано: 22 май 2017
- Test and teardown of a Li-Ion 18650 battery charger from Ebay for just $1 including shipping. It's a very clever design, but it also is quite dangerous.
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for 1 $ the transformer looked very nice to me. In some USB Chargers, there were transformers without any isolation and they cost more than 1$.
Well done, I like when you add the explanations.
Well done for investigating theese dangerous products (that manny people use daily) i admire your effort in reverse engineering the whole thing
For goodness sake, put a fuse in it!!! Got to admit, That HD3582 output chip is pretty cool though.
I have one of these Dodgy💀 Li-ion battery charger
Terminator also clever, but dangerous!
This is probably the best unboxing video I have ever seen in youtube.
Love your precision screwdriver...!
Thank you, it is nice to to know there are others out there, I don't feel so alone after watching this.
Great video! Despite your strange accent on each end of the sentences, I was able to understand everything you said thanks to your detailed explanations! :)
Czech
If anyone has a problem understanding some words, just turn on CC (closed caption) near the bottom right of the video screen (desktop/laptop only). Even CC can't understand it, and shows some gibberish lol
I like it anyway
I purchased this charger today and then I saw your video 😂
I am using this from 10 years.
nice very helpful for understanding how this kind of chargers work
You just made me very nervous since I just got a few of those chargers. I'm currently looking for a replacement. Thanks for the info!
I got shocked by on of these. It went flying across the room :)
I bought a similar one in December and arrived 2 days ago. The board design is similar, but it has an optocoupler and the chip is different, and it has no pollarity detection. Same issue with the izolation on the PCB. I will use it by first connecting the li ion pack and next put it in the mains plug and the oposite after charging. This way the risk of touching the terminals while the circuit is powered is minimal 🙂
clever, dangerous, a dollar. that describes a lot of electronic stuff Ive got from chinese ebay sellers over the years.
Your videos are very informative and well done. I'm wondering if you could evaluate one I have and compare/ contrast it to the one in this video?
Thanks. I have 2 of them. One detects the polarity like yours ( I didn't know that untill now). I was wondering why the polarity was reverse. Googled it but nothing found about it. I thought the instruction on the charger was wrong, So I was charging my battery in reverse. 😅😀 thanks for clear description.
Thank you for the review. I have the same charger and was wondering how safe it really is.
If the 12 ohm resistor in the emitter gets around 5v across it, there won't be enough voltage from the feedback circuit to turn it on. So the primary current is limited to around 420ma.
I like tiny Transformers, I had one that turned in to a car
Even forgetting about the whole charger thing thanks for explaining how these black magic single-transistor SMPS work.
Thanks for this presentation. I just warned people in my FB profile not to buy this one and after this, I’m glad I did. This was really awful and I didn’t expect this bad construction.
It is not safe to use ??
Hats Off To You Bro To Your Patience to Draw Reverse Enginered Schema.
You are very good. Thanks for all this work!
I really like your reviews of deadly chinese mains powered crap. Oscilloscope readings of these switch mode supplies would be interesting
Best Inglish Evar (I'm serious I like it)
Your acceeennnttt
It very weEeiireed
It drives me crazyYYYyyyii
No its good )
Ur name
@Joachim Shekelberg who says i'm gay
Thank you! I though it was just me! hahaha To me sounds gladly funny, i keep laughing :) His accent sounds like from India or Morocco, but maybe its my spanish ear (Note: I have Czech friends)
Good analysis, well done ! 👍
I used to have one of these for charging a 14500 battery that went to a small flashlight. I think eventually it refused to charge the battery. One time, i tried a AA battery because they were the same size, but it obviously didn't work, and I was like, what the...?
got the new model, the main EU plug is longer, installed 2 resistors 22ohms/1w at each side to the mains that was direct and a small fuse, works fine for 0,90€
At beginning I was interested to understand this charger but after one minutes I felt in love with accent
Got very similar one that came with a Laser Pointer.
I'm a bit afraid to use it. Right after unboxing (didn't even plug it in) it gives that very strong electrical smell.
DGW! This is excellent! TYVM! Interesting problem with this type of circuit: This won't charge a flat battery. at 0v it won't know which way is positive and doesn't charge.
The actual HT3582D does have the feature to charge cells from 0V - I wonder what they did with it that it won't when used in these chargers?
I am using around nine of this, through a decade all works good till date
I just took one of these apart. Google knew what I was looking for when I searched "jia-xin charger". It's in the same housing (with a US plug) but with an updated board with a date of 2022.3.28. Other board markings are XC-018L and NB1386. It's even more minimalist, without the charging IC, just a super basic zener diode/optocoupler voltage regulator. The isolation distance is nonexistent, maybe 0.5mm between high and low side. It came in the package of a green DPSS laser pointer of unknown provenance with no IR filter, along with a suspiciously lightweight 18650 battery. The triple threat of blinding you, electrocuting you, and burning your house down.
Love your extinguisherrrrrrr...thnx for the info! 👋🏼
Oh wow i just remember i have the same battery charger i get it from when i buy a flash light
The most impressive thing about that is the output chip, containing an H-bridge output stage, capable of detecting polarity, and the voltage threshold cut-off for the lithium cell. I would definitely upgrade that 1N4148 to a 1N5819 schottky diode.(rated 1 amp, 40v. Then, if you dare, can drop the value of the emitter follower to get more current. I wouldn't try to increase the amperage past the nameplate current of the charger. While the transistor is rated for .5 amps, the transformer has a 11.3 to 1 ratio. At .5 amps output, the transistor only sees about 40 milliamps. It's the transformer that worries me the most. Also, if the transistor doesn't switch a clean square wave, transition losses could heat that up. For a dollar, it might be worth a try to bring one of these up to advertised specs. Be careful, you don't want a lithium ion cell all down the front of you.
On the Hotchip Manufacturers data sheet suggested circuit, they show that diode as 1N5819/1N4148.
Not exactly equivalents but for $1, looks like this version took the cheaper one.
I bought a dual version made in 2015 and it has the 1N5819 but includes all the other dangerous stuff.
0:41 No worries! I've got this special fire extinguisher here
Probably sand in a bottle
i have the same charger and it shows the correct polarity for positive and negative when i checked it.
great. Which book or course do you recommend to learn power supply design?
The HT3582DN is an interest little chip. Good video!
Have one of this chargers that come free with a baterry and a flashlight i bought on ebay, noticed the inverted voltaje too, BUT for some odd reason when i put the battery the charger works normally, have this charger for like 4 or 5 years and still works, sometimes i check the polarity and is inverted, put the battery to charge and works normally after a few seconds.
I've just received that same charger today, and it exploded just 15 min charging the battery that came with it, opening it, the 2u2uf 400v cap was the one that exploded, I haven't check the other parts yet, but for 1$ ...
Good work Dan, as always. ;) For these dislikers, rather comment what you didnt like or die by chinese suicide electric tools in horrible pain.
The "EU" socket usually is Asia socket following German style socket or lower profile socket.
These are used in China and South Korea.
Thanks for the information.
his voice love it
"there is some kind of sticky taaape"
Dangeroooos!
what is your solder remover? is it desoldering gun?
i had a few of these double ones , in one the capacitor explode :D and in the another one the spring for the battery holder broke...
well done
nice work
I bought two chargers of these Chinese
I ask: It is dangerous to put the battery with the reverse polarity, I think it can cause a short circuit
I have checked that if the battery is first placed in the charger before placing it in the AC outlet, the polarity is correct ...
For the cheap price it is better to change the internal circuit for a Tp4056 and a USB connection and we have a charger with a retractable slot.
Greetings from Venezuela.
Thanks for the schematic
I got one of these included with a li ion torch. I had a look inside and upon seeing no isolation what so ever I threw it in the trash without using it even once. This damn piece of crap is dangerous!
berni8k
You could in theory remove all the circuit inside and fit a good power supply and charge control chip inside. It'd make a good universal charger, but it would exceed the cost of the item itself! :)
maybe dangerous to a novice but i could use it safely with a couple of modifications
Isn't a transformer isolation?
It actually has a step-down isolation transformer in it, but this one didn't look like the best quality.
I am looking for electronic Schematic plans for Power Supply of a Server the Compaq ML 370 G1 and G2
excellent explanation, congrats. i got one of these included in a product I bought and, I wont use it :) mine said zhinengchongdian in the front, and in the back there was no sticker, only model: JXC-001, output 3.7V/500mA (end-off change voltage 4.2V+-1% . i saw the 12 min of video, learned somethings, nice editing, congrats, one more subscriber to your channel!
I have about 12 of that same type fire extinguisher, but in my refrigerator 👍🏻
LOL Czech fire extinguisher!
I think this device will plug right into an Italian socket, and maybe, in the most dangerous way, into a Danish socket. It will also fit into mainland Chinese sockets, which is likely what they had in mind when they were designing it, but not into HongKong sockets. By the way, Chinese sockets look a lot like your adaptor, they accept both round and flat pins and have flat surface without recess.
According to the datasheet, the current is internally regulated by the charger IC HT3582D, to average 300mA and max out at 400mA. If it actually delivers less than specified on average, that's likely the limitation of power supply on the input. I don't think the chip, being as big as it is, getting hot is such a big deal - it's designed for 1W of thermal loss at 100°C/W according to datasheet. I have TP4056 (LTC4056 clone) modules that are set to 1A and they get very warm but not dangerously hot, and they are linear regulators and quite small. The power bank IC such as MP3401A also commonly use linear regulator when charging. To limit the temperature, they could reduce current when battery is empty, ramp it up as the voltage on battery gets higher and regulator doesn't need to work so hard, and taper it down again as it's close to full.
The charger IC with polarity detection and internal current limiting and temperature limiting looks nice. It's the cheapest 18650 charger you could get, so i might like to get one to rip out the mains portion and simply connect the secondary to a USB socket, and maybe limit the power by an input resistor or something. By all reason, they're dumping them under cost because they can no longer legally sell a device with such a bad separation since 2006 in China, and Chinese punishment can be very fierce.
That cat is waaaay pretty btw! So pretty!
I couldn't find data on the HD3582. But, the transistor is rated for .5 amps 400 volts That's plenty, as long as it switches cleanly. Two big problems: The 1N4148 diode is only rated for 150 milliamps at the most, and the lack of a fuse on the supply side of the 1N4007 diode and the 2.2uF capacitor. If that diode were to fail short, that capacitor would literally explode almost immediately. I would replace that 1N4148 with a 1N5819 Schottky barrier diode, which is rated 1 amp at 40 volts. I don't exactly trust that transformer either. Oh yeah, don't forget the fuse!!
@@Lenzak800 Translate google:
product description
HT3582DM is a universal charger with built-in reference voltage
Control chip with automatic identification of battery polarity, short circuit protection, over temperature
Protection and other functions.
main feature
◆ Built-in reference source, regulated output at no load, no external components required
Adjust the no-load voltage
◆ Support ordinary three-lamp mode and two-lamp mode, seven-light mode
◆ Maximum charging current: 300mA
◆ Support charging 0V battery (battery is connected)
◆ Switch to constant voltage charging mode when the battery is fully charged, the battery can be charged
More full
◆ Automatic identification of battery polarity
◆ Short circuit protection
◆ Over temperature protection
◆ Highly integrated, few peripheral devices
◆ Miniaturized MINIDIP8 package
I have it and it fits in my home because i have older version(less deeper ) and it works also i have extenter adapter
your accent is incredible
Great 👍🏼 video. Big FAN of urs.... May I ask why is there 3 windings in a transformer and not the usual 2 ( primary and secondary windings)?
Thx 🙏
If you watch the video, he explains all of that. It has a feedback winding, to sense the voltage on the secondary side, rather than a proper voltage reference (eg: TL431) and optocoupler to signal back to the primary side.
Most cheap power supplies have the same arrangement, and the advantage is... it's cheap! In this application the poor voltage regulation doesn't matter in the slightest, since the IC on the output gives the cell what it needs.
Great explanation! Do you have any books to learn all of this?
Could the 250 mA charge current was because the charger was in the Constant Voltage phase of the charging operation. The 450mA is probably the charge current when the charger is in the Contant Current phase.
how to know when the batter is fully charge?
at least it uses a transformer to step down the voltage,not a capacitive dropper as i was expecting
I got shocked by one of these. Maybe the spring was touching a resistor that was connected to the mains or just an isolation problem.
Do you use sheet music to sing the narration?
Very good explanation. But you are using reverse term open/close for the switching transistor, 13001 in this case. CMIIW
Looks like your special fire extinguisher needs refill. xD
1.Get pliers/use bare hands or teeth to rip out those two prongs,
2. Solder some lenght of wire terminated in proper two-prong european plug. (Just cut it off something you fried).
- solder a fuse in the line if you feel like doin' it
3. done.
Seems i forgot to insulate the live soldered connection, but you will get reminded in hard to dismiss way, the next time you grab it anyway...
not in all europe is that pin in the socket i belive is just in Italy
I have a similar one , this can detect the polarity.
One layer of tape is massive. I have seen a single coat of laquer as insulation on things before.
Acid test is would you touch a live connection with one layer of sellotape around your finger tip.
Me, I'm a coward. I prefer dual bobbins.
Well for $1 I would say it is bang for the buck. Well you shouldn't expect a gold brick inside it anyways :D
Diode gone wild
Can you please also change this charger too usb 5 volts so i can learn how to safely do it thank you
Simply remove all the internal circuit, and fit a TP4056 module inside. Safest to get the module with "Protection" as that contains some extra IC (DW01) and a Mosfet that will shut off the power if it is under or over safe voltages. The TP4056 is a very good IC (you can google it) and the modules are under $1 on eBay. By default the TP4056 modules are set for 1A charge current but you can change the sense resistor if you want lower current.
Well ,I got one of these ,and It worked fine ,for $1.50 What do you expected .
Thank you so much.
I bought one of those and it didn’t charge, I was confused cuz it the led light kept turning off when I was inserting a battery! When I checked the voltage with a multimeter the polarity where reverse! Thanks god I didn’t put the battery on it for long.
Merci beaucoup pour l’exercice
😂😂😂😂 funny accent mate.... great upload gizzza✋🍻👍
I lke most of your smps video. from there, i learn how smps work. But its so funny when you say dangerous as dangerus... :))))
Not 'dangerus' - he says "danger-rooose". In more recent times, he just says they are "dodgy".
It fits in Denmark, here the ground is female and not male like in Czech. Also most of our plugs are not recessed, and house wall plugs are not recessed.
I've never ever seen an IC in that form factor.
where we can buy this
Li on battery has it's own stop charging when full, it look not danger at all, i used many month already ,no problem .or may be I'm not understanding something?
Not every Li-Ion battery has a protection in it.
you destroys everything. " ohh is it safe, i don't know but i destroy it and look inside"
Meken thouch battery ekak chaj keruvehekida??
Your interesting accent kept me going till the end of this video.
We have one of these charges so looking is this video I just broke that charger half 😂 and take the components and broke them in half too
lol
Buy or not to buy?
It will fit to old french socket, which are flat.
What about a usb 18650 charger? They also cost a dollar, and there's no way to burn your house with one of these things (at least not so easily).
omg i had this charger for the battery of my flashlight, one time it failed and it gave out main voltage very dodgy indeed
Yes, than you for the very well put together video.
I have to ask, what is that accent? It is unique and a little strange at the end of words.
It's Czech. Most likely.
I loved your acceeeent
I mean, it costs a dollar, it's good enough. No battery should be leaved alone while charging anyway
One dollar can never be of high quality versus $5 or $10 provided its high price are not just markup or repackage. Buy wisely and double check should one has a budget consideration.
using a dangereous adaptor with dangereous charger must be clever idea
just kidding, i love your videos and i am following you from turkey. very nice videos mate!!
What is the dot on the transformer say pls explain in the next video kind request of your fans pls
Tells you which ends of each winding are in phase with each other. All the dotted ends will go positive together at the same time
Sir battery charge ko repairing kaise Karen
DAMN! How long dose it normally take to fully charge? I can't over charge it and blow the damn thing up can I?? The lights been red for ages??... I seen your battery vid also and mine must be a fake battery because it's running at 4200 mAh- 4.2v a Li-on product,, certified please someone let me know,,, thank you,,oh and anyway TOP VID👍👍✌️✌️
You plugged it into you adapter upside down which is why it's reversed polarity. Also can't believe this is possible with euro plugs, can't do that with Aussie plugs! 👍🇦🇺 🍻
ac doesnt has polarity issues