's take a look at the little rechargeable led work light and power bank. And and this is quite an odd design and my apologies. I don't know if is going to really make loud popping noises or not in the microphone. But it opens like this and the middle bit also opens without clicking noises to give a light that can be pointed in multiple directions.

It can be stood up in its end. It's very versatile and you can get a fairly wide and controllable coverage of light. It's got a button in the back that enables both one or the other it's kind of a crude way of dimming. It also means you can control.

Which area up gets illuminated. But it's uh not get any pulses modulation or dimming. I don't think. It's got a strobe mode.

Let me just hold the button in no it does not have a strobe mode. It just lights up okay on the back. It also has this little rubber cover revealing the battery level indicator. Does that light up yes.

It does light up when the thing is active. And it's rated for a output of 5. Volt at one. Amp i tested at 52 amp.

Before it cut out uh. It also has is that a usbc input. I think it is that's quite good but anyway. Let's take it apart so i'm going to guess that all the electronics will be in here and are the batteries going to be in this bit or are they going to be down.

The middle is it going to be eighteen six fifties because it does say five thousand million power and two thousand five hundred million power is a fairly standard value for uh an eighteen six fifty. I could be wrong i've not had it open so i don't know what it looks like yet. We shall find out together. So she'll take the screws out and explore i have to say that these have come on leaps and bounds since they first started appearing and they are super useful now which bit is a it's these bits here.

I'm going to guess that these have to come out too that kind of rules out the possibility of there being 18 650s in the middle. Because uh there'd be screws for them. And they don't generally like that what's happening. Now is this going to come apart.

Am. I going to have to pause. Oh. That's still not coming apart.

Does it clip together as well or is there something else i don't know maybe all the screws have to be taken out or are there other screws down those holes. Oh there are other screws down those holes. I think i should just keep taking the screws out until something falls apart my apologies if this starts. Getting long you can always skip to the bit where it's completely open.

It always does take a little bit of time and yet if i jump over these bits. People complain that they wanted to see how it came apart. So let's take it apart. Completely is there some other secret to this that i don't know i may end up having to pause.

If this doesn't start coming apart quickly it does feel kind of loose. It feels very loose. Still doesn't want to open does it oh that's good so this slides off apparently like that so that can make it come open. It feels better.

It's making crunchy noises. It's not opening uh or there there we go oh. I wasn't expecting that right uh for reference. The front comes off like this i don't see batteries in here.

I see a completely sealed module around here with this big scuff in it that has all the electronics under a cover in here. That's quite interesting. And it's got a connector then that connects the other side let's keep taking screws out and then i'll do the usual. I'll open the other side so we can see what batteries are in it.

But i'll also take a picture of the circuit board and we can analyze the circuitry. I'm not expecting any great surprises. I'm expecting a a usb charge circuit and also just a simple microcontroller with the button just switching two transistors. One for either side this comes off it's got the cob on it well.

I thought that was a connector. Oh there are connectors underneath everything's in connectors. Okay off comes this connector. These are kind of keyed that just appears to be a waterproof seal that white.

But okay out comes. The circuit board four screws uh that'll be the charge circuit. Oh. There's the it's a power bank circuit.

And there's a little microcontroller all fairly stock uh. There's one two three four transistors. Oh are they in parallel they might be in parallels this spoilers. If i tell you now before i've even taken it out and analyzed it and i'm not expecting there to be much on the back of this circuit board.

If anything there's the two connectors the usbc the button the standard usb outlet outlet. Some charge leds pairs of them and then the connectors here right tell you what since all the screws are out anyway. This is just falling apart left right and center. Now let's get these out and see if we can find the battery in it is this going to go back together again yes.

It is okay this comes off it should come off it's not coming off is it revealing. Oh. A flat pouch lithium cell. Under here and uh.

The cob is the cop press against it. No there is space between the two of them for heat dissipation. Right here one moment. Please.

I'm going to reverse engineer. The circuit board reverse engineering is complete let's explore so one side of the circuit board. We have the usbc connector. We have the usb output connector.

We have the three connectors that connect to the two led cobs cobras and the one that connects the battery. Which does have thermal sensing. Which is quite interesting. We also have six leds pairs of red and green which are the red flashes to show the level of charge and when it's fully charged it just switches.

All the greens on i think they've just left their options open all the greens are lit right now. But it's still taking a charge more on that later so. This is one side of the circuit board also a large area of ground plane this is the other side. I also have to correct something i said in the first part of the video.

Where i said i test the capacity at five the output current capability at. 52. Amps no it's. 12.

Amps i was thinking ahead when i said five so 12 amps and then it tripped. But that's okay one amp output is fine for charging many things. The circuitry is based rather predictably around the little microcontroller and they have used every single pin in this and a dedicated powerbank style chip. But it's being used in a bit of an odd way and uh also the leds are being switched by pairs of a09t mosfets in parallel just a guess for increased current handling.

I'm not sure what current it's actually switching the map. There is also another p channel mosfet. Which appears to be disconnecting the battery from the usb circuitry. So maybe.

It's got quite a high quiescent current. It's just trying to get around that i'm not sure why they're doing that or maybe. It's just no i don't really know it just as shut off so it doesn't over discharge. It that's possibly it um.

I shall let you take a look at the circuit board briefly and then i shall bring in the schematic for your entertainment. Oh things worthy of note. A splodged resistor here. They've patched.

A resistor in oh and a couple of inductors here for uh filtering. This uh resistor. They've just obviously missed one out interestingly instead of putting it there if they run out of space and design. Which are doubt i think they just accidentally left off they could have put it down here uh between the pin 2.

And the ground rail um. Other things where there's no this pin is floating that's quite an important thing. That's worthy of note. Because that's a voltage programming pin on that chip and if it's left to float.

Uh it will try and. Charge a lithium itself to sell to 435. Volts. But the lithium cell does a protection.

I believe i shall find out because the project is currently well the experiment is in progress. It's still charging at 700 milliamps even though it stopped theoretically uh charging it reached full charge a while ago. Interesting we'll see what voltage that goes to if it cuts off the internal. Chip it will be 425.

Volts usually so here is the uh battery charging circuitry. Which is using a standard power bank chip. An sp 4533. It's just got two output leds one to show when it's charging uh the cell and the other to show when it's a got a load.

And it's discharging that would normally just control a red and a blue led in the tiny little power banks. You know the ones are like this sound of the compressor in the background. Not to worry so notable things the positive two this uh actually come from the battery comes via that transistor that p channel mosfet. I'm guessing the cell itself is protected um and it can switch it puts a continuous battery feed over to the microcontroller.

But it also has a facility to get a signal from the microcontroller bat control to uh switch. It so this switched battery positive is actually just going here and through that filter circuit to the uh. The boost inductor that steps the voltage up the voltage is stepped up it comes back out uh to the usb output port note that i've written x3 next. These capacitors that just means.

There's three of them. In a row. Let me just show you that these plated through holes are connected. Here so one two three and uh for this one for the incoming supply supplies one two and three before the inductor and then another one afterwards lots of filtering.

I wonder why they did that oh you know what i didn't fully color this in i feel obliged to color it in now let's finish coloring it in blue for the negative. I use blue for the negative. It's just better to differentiate in black right okay other things worthy of note. The data pins on the usb port the output port are just connected together suggesting.

It is basically set it as a one amp output type sort of thing so that anything plugged into it will just see that it's also worth mentioning the usbc in there's no fancy circuitry to signal back to the device. That is plugged in there to even put out power. Some devices won't put out power unless they see they're connected to a specific load. Usually the sort of on the go type usb.

I think but in this case. It's just relying on a dumb lead being used in a dumb charger. Just putting out 5 volts on a usb connector. There's no programming resistors to tell it what it is other things the unit signals to the microcontroller when it is actually charging the battery.

And it also signals to the microcontroller when it's discharging. Which will trigger this of the led display that's the resistor that was podged in at a funny angle and upside down. I thought it was a capacitor initially as extra filtering. The usbc comes in and it goes straight to the.

Chip but there is a snubber across that just for filtering 15. Ohm and sears the capacitor. But there's also a 1k and a 10k resistor for me a potential divider um. And a pull down resistor to the charge connected input to the microcontroller just to tell it that you know the usbc is plugged in and to start.

It's little blinky light show. Which would also happen with the charging and stuff like that it may also signal. If it shut the mosfet off it may actually if the battery was too low. I'm guessing it might be battery protection not really sure i've not been able to test that yet because it's a very fat battery and uh.

It's going to take a while to do test that the microcontroller. The mcu has a the supply from the battery with the permanent supply not the switch one uh comes. Via a 10 resistor in the capacitor for filtering. Uh.

Other things where they've note. There. There's also a resistive divider with a 300k resistor and a thermistor built into the battery pack with a filtering capacitor just to provide a stable voltage from that and that just tells the chip. If the battery pack is overheating in some way.

I guess that might be if it was getting too hot with the cob chip maybe i'm not really sure i don't know what their arrangement. Why they're monitoring the temperature. And there are three 1k resistors going to leds in pairs and the way they've done it they've used four lines to control six leds by swapping. The polarity of this common so if they wanted to display all reds they'd make this negative and then light the appropriate number of reds via that by making them positive if they want to display as they do that and all the greens.

They just go static. They'll make this one positive and they'll just make all those negative the switch is just a button bridging to ground it's got internal pull up in the microcontroller and the control for the cob led arrays is two of these in parallel to a090 mosfets with a 1k resistor driving the gate and a 10k pull down just to make sure it stays off. When it's not getting a signal from the microcontroller and this whole circuit here is repeated twice for the other cob and that is it i'm just looking over at this thing. No it's continuing to charge.

I shall leave a comment in the description down below telling you what voltage it charged up to i reckon. It's going to charge up to the point it cuts off on the uh on the internal protection. The cell. If it has it but if it goes higher.

I'll let you know what voltage it terminated at. But that is it the uh lidl uh rechargeable power bank and work light. I mean. It's a sensible and a functional design.

It's quite maneuverable also has magnets in which is quite handy cause all. The screws are now stuck to them and now um. I'm going to put it back together because it is quite a useful light it's quite functional.