I have a Chinese LED Flashlight myself. Mine is a bit more advanced, but it uses the same dodgy plug. In my grandparents' house (which was made in the 60s) we still have some flat bed plugs, so I could plug the flashlight there easily. Once while I was taking it out somehow I touched the live connector. Luckily I was not grounded, but it zapped the f**k out of me. I reworked it and turned it into a DC flashlight that uses an external AC/DC converter.

7:27 In china, they use the lead wires as fuses! XD

I once took apart one of those. It had sealed lead acid battery in it, but its terminal was potted with *twinkly nail polish.*

I was hoping you would plug it in to see the battery explode.

Also, there are the shallow European sockets used almost exclusively in Asia. They have no earth connections and it looks like a circle with two holes. I think this is designed to go into those.

Once I tried to measure the open circuit voltage of such a charging circuit from a rechargeable light and I got around 150 VDC but after connecting the battery, the voltage drops to 18 V

That is a scary looking thing.

Someone asked me to repair one of those. Looking inside, I found out that the connection to the battery was broken and all the LEDs were burned. Because there is no filtering, nor any parallel resistance, without connection to the battery the LEDs are exposed to much higher voltage than their ratings and therefore will burn very fast.

Love that Chinglish manual:-) :-) :-) :-)

I had a lot of Chinese products with rechargable battery and they usually die after first few chargings. To plug it in you need to use some kind of plug extender which is sold separately

thats 4v lead acid battery.. these type of torches and lamps are popular here in india because they are very cheap mainly because of that battery which is really really cheap here. it will charge with 240v and they are dangerous i have got myself shocked many times when trying to modify it

circuit diagram round hi/lo switch cannot be correct or it would be on ful in both hi and lo positions

Can you please modify it using 18650 battery and charging system for 18650. In addition, can be use also as a power bank. Cool huh?

China has a weird socket which accepts EU, US and Australian plugs. Not every EU socket is hollow, but these contacts look dangerous.

This type of plug used in India. Indian sokets are similar to European soket but the diffrence is European soket is hollow and Indian soket is Flat

What do you mean by the wall plug mechanism looking dodgy? It's space shuttle technology right there. Chinese space shuttle... :P Welcome to the warm, sparkling, tingly and exciting coziness that is teardowning of chinese ebay/ali-finds! :D I just love that stuff, I hope you make many more (and survives, lol).

I think is for 12 to 24vdc connection if capacitor is 250vdc

Another error: The capacitor is on high value. The 4V battery is approximately 1Ah. And you charge it on 220V. The charge current must be too low (for on 110-220VAC). So, the capacitor may be 470nF - 400V AC type. My god! The text on the box errorly too. That torch produced for studying "how produce an errorly flashlight".

May be the dropper capacitor can rated for both AC and DC Voltage.

DiodeGoneWild, How this charging circuit could charge this 4 volts Pb battery, as it should be very high output voltage after the bridge rectifier ??

You could use an italian plug for all those that don't fit the eu one

Have you measured the battery and the capacitor?

very nice review. Only a small correction if you don't mind. In the case of 110v is 60hz and not 50.

saudações do Brasil + like. informações úteis. sucesso.

I too, would use just 1 resistor

I want to see what inside the battery?

Your calculations are exactly what I got for 50 Hz mains. I'm from the United States of America, we are at 60 Hz. Thus, the light would draw 90 mA @240 V, and 45 mA@120 V. The reason for individual resistors is because LEDs have varying threshold voltages. That means that the current would not be equally distributed among all elements, causing some to be brighter than others at the very least, and at worst, some LEDs could be overloaded. As an LED gets hotter, its forward voltage drop goes lower, which means the hottest LEDs will draw the most current. That would shorten the life of the LED flashlight(torch) as a whole. I agree with you 100%, I would like to see a 22 Ohm resistor on the input, and a 200 mA fuse on the input, to limit inrush current in case the plug makes contact during the peak of the AC wave form, and the fuse, just in case a diode shorts, or the capacitor shorts. I would like to see a 400 V capacitor used. If it is indeed a lead acid battery, there needs to be a Zener diode, or a series of silicon diodes, to limit the voltage to the battery at about 4.6 to 4.8 volts, to prevent overcharge, if it is indeed a lead acid battery. Diodes are great, because they will change with temperature, like the battery does, and help maintain an appropriate float voltage for the battery at varying temperatures. That would allow the unit to remain plugged in safely, until needed. It wouldn't take much, to make it a very useful and reliable emergency light source, or, just simply handy. I'm really interested to see what kind of battery it actually is. Lead Acid batteries don't like continuous overcharge, especially at a high rate compared to its capacity. That design won't hold up if someone just leaves it plugged in all the time.

Dude, it would be nice if you show the light beam coming out of this flashlight. We already know its a junk just by looking at it. And EU socket is not hollow but recessed. Thanks

Pls plug it in power socket

Chemical batery

I hate these chargers, but if this torch had an intelligent charger module this would be one of the most reliable torches, why? even if one of the LEDs burn out the rest of them still works.

where are you located? Czech or US? :) nice day

This socket is old brazilian socket

Its only for the non-recessed Thai sockets ( lethal without shielded pins ! ) & Chinese death-travel-adapters & Chinese multi-plug death sockets ^^ Oh ans classical Capacitive-Dropper of death ( see "BigCliveDotCom" & "John Ward" ) instead of an isolated power supply ^^ its good that it does not fit in recessed German & French sockets, this is the only thing that makes it safe ^^ Edit: good video

The german socket is The best

Scary lamp ! 😚💥💥💥😉

You can get this lower than 3 dollars in china

Can anyone tell me how do I calculate capacitive dropper circuit's output current

I have the same battery in my flashlight and it's 3.4v

There might be a short circuit in battery

Chinese wall sockets have 2 pin euro sockets that are not recessed

The charger is really dojjy, the brown capacitor may explode at any moment and make the battery acid leak all over the torch

In China, the fuse is firemen

Some old eu sockets are flat and don't have earth.

sir i have 30w led chip i run 19.5v laptop adapter here amp rating is 3.3amp led glow but blinking what i do . i install 12v cooling fan also to keep led chip cool.

In some Asian countries, they have sockets that accept European plugs, but are not recessed.

75mA*12h=900mAh

Avoid bumming 🤣

Led is 4.8 mm

4 VOLT Battery!!!

👍👍👍👍👍

And what about measurements? And your dodgy adapter to plug it in? Or solder a mains cable? No test???

Crap light. Theres also no limit to the charging voltage. Probably why the battery bubbles. In my european country we have wall sockets wich are not resseced and plugs without the isolation ... I have never heard it should be any problem safety wise. Thanks for the teardown.

Sir I don't know rated value but I am shore this chip is 30 watt. Firstly I use 12v 2amp adapter its brightness little low after 4 to 5 days my adapter suddenly short circuit And never repairable. Pls tell me about amp or milli amp its working condition bcos I control voltage but how to manage amp or milli amp. Pls clear this picture. Thanks 4 reply.

When Chinese make them

You'd think this was the first crap, Chinese product he had ever seen. Not only is the product not up to code, but they lied about the flashlight's specs. The product might also have been made by someone who did not know what he was doing. There was some good detective work done in the video, but instead of the flashlight being weird it is just a ripoff product. KZfaq must be changing some of their algorithms because this is the first time I've seen this channel. I've been seeing many channels like this one just pop up recently in the recommended videos list.

buming Plup Directiy Buibs Forkword Hight LT can save electricity Love the Chinglish : If there would be LTT (LinusTechTips) can save electricity i would laugh hard

Lead acid batteries are dangerous

Looks very flimsy

Old swiss socket works fine. But very dangerous: Breaks easily. Very poor quality!

It's designed to plug directly into the wall plug.

The flashlight uses a Chinese outlet as it's plug.

Bapskatha

6:04 *notices the buldge* OwO what's this?

where 373 Volts ? series RC circuit Drops the Voltage and limits the Inrush current no ? Measure It Please !

European

I WISH ONE COULD BUY flash LIGHTS WITH ON OFF SWITCHES INSTEAD OF THE 3 OR 5 SETTING ic boards that drain my battery i guess i cab buy a old 6volt lantern n stick a car led head light in it with a battery pack n dimmer knob and a toggle switch be a cool build fer this guy to do ..pardon the capital letters i hit caps button wilts pecking words out

You first world people have never seen this type of light, in third world countries this was common in the last decade

49% nn 149%

Those plugs are not european but asian.