Hello post to open so it's post bag right? these two first because they are related battery tester, battery tester. but one of these is old school with a little moving coil meter. Oh, it's got some shrink wrap on it and the other one is. well I Suppose you could say new school in that it's got an LCD I'm not sure why the old school one has got all this nice wrapping on it.

landfill, right? Let's get an AA battery and test it. I've got these uh Energizer Lithiums where the Um use date was until 2021. I'm pretty sure they have a 10-year life. so I bought these in 2011 from the Pound shop.

I've put an x on these because these two no longer run my workshop clock. But let's see what these two things make of them first shows you which way around to put it there first. this oh that's not too good is it it's in the red there and uh, well. let's use the same cell and then this one and this gives you voltage.

so 0.99 volts which is a bit low because I think these start off at 1.6 volts. Let's try this one. Oh well, there we are. That's higher.

1.43 Now the question is, does this thing put any load on the cell when it's testing the cell? Um, these are held together with screws so I can undo the screws and um, see what's inside? Let's have a look. Okay now. I'm not sure if these are designed to do Lithium, but I'm just going to try this. Uh 14 500 Oh Nmc cell I think it is.

Uh, so it's that way around, isn't it? Let's turn it up that way. Yeah, it works 3.74 volts so it doesn't get the hump. I Got a feeling these were specked for voltages up in that range and actually that's my intention for this. What I wanted was say I've got an eight Cell Lithium battery What I wanted was eight independent voltmeters was that two digit.

Let's just check that again to two decimal places. Yes, it is. So I wanted What I wanted was reasonably accurate. Voltmeter don't particularly want any loading on the cell because that's just going to use upsell energy for no reason.

So we'd have to look at the circuit in here. There is a little 16 pin I think it is. yeah, 16 pin chip. There's an inductor here.

What's that inductor doing there? Is there a switch mode stuff on here? I don't know or is that just um I don't know, reducing noise or something. The LCD is under there and I think I can see along this Edge there's a zebra strip so I think this board is part of the LCD so if I take these two screws out, it's all going to come apart and not work. But I think we should go to AliExpress to look at this now. So the analog meter on AliExpress is this one 2.50 this came from Oh Zhang Yi Chang Smart Home Electrical Store and the LCD one which is called a Bt168d.

The analog one is just a Bt168 uh, Digital Battery Capacitor Tester. this is from Jing Tool Store Uh, 3.39 What's that one? Free shipping? Yes, Free shipping. And I'll put links to these in the description. Now does this say anywhere that it does Lithium cells? There are quite a few cells uh shown in this image here and if we scroll down scope of application testing multiple battery specifications I'm sure I read in one of these that it could go up to the sort of voltages that Lithium was.

Anyway, it didn't seem to blow up. So um I guess it's okay. And what I like about this is that it's self-powered so it doesn't need a separate power source. It actually operates from the voltage that you put on it.

So yeah, that could be. Um I could cut across there and across there and then just Mount eight of these on a piece of wood and use them as cell voltage indicators. Need to do some testing, see whether there is a a load placed on the cell. Check the accuracy and all that sort of stuff.

Find out Well, that inductors for on to the next one. What is this? That knife really didn't penetrate the plastic at all. Did it right? This is it. Um, it's a lot smaller than I thought it was going to be.

It's like the whole thing is in miniature. I've got a sort of impression from the AliExpress uh listing how big this would be and well, it isn't but it is very neat. Um, this is a buck converter and uh, it's quite high power. I Think quite a neat design in that you've got this heatsink with a fan at one end of it blows through the heatsink and the inductor is sitting at the end of that, so it cools the inductor as well.

Here are the switching devices: I Think it's a very primitive butt converter. so it's a mosfet and a diode. Or which way around is it? Uh, yes, that's the diode because the two outer pins are connected together. So mosfet and diode.

um, a controller chip. Got a feeling it's quite a high input voltage I can't remember and just a single pot for controlling the output voltage. I Think we need to go straight to AliExpress to look at the specs of this. So this is the item on AliExpress Uh, high power DC DC 25 amp oh 25 amp Uh I Think we'll derate that immediately.

Let's say 15 amps adjustable. step down Buck converter power supply module. So 12 to 75 on the input. That seems plausible.

Um, to 5? 19? 21. Well, any voltage, really. You adjust it on the potentiometer there. Um, step down modules.

so Buck converter. Um, what's it say here? 600 watts 25 amps? Well, we'll derate the 600 watts to I Don't know about 200 or 300 I think I mean I'd Never run this at 600 watts I presume that's if the output is at 50 volts, you might find the output goes higher than that. I'll keep changing the image don't I Um yeah. so eight dollars and six cents that came from Electrical Equipment Tool 888 store and was there any shipping? Yes, there was a bit of shipping.

Yeah, so I Just liked the novel design of this. Quite a lot of capacitors on there. got three input capacitors, three output capacitors. Um, controller chip in there somewhere.

Possibly also a little Buck converter here to provide a power supply to the controller chip. That's probably an Op amp. Should use a pointer for this. Really shouldn't.

I that's probably an Op-amp My guess is it's measuring the small voltage or it's putting a gain on the small voltage that's on these current sense chips. So yeah, very straightforward. I Wonder if we can get a part number for that chip? Uh, no. because all these chips are milled.

They're beautifully milled. They're exquisitely milled. There's a lovely Milling pattern I Don't know where you can see that, but yeah, it's a really nice Milling pattern on the top of those chips. So no, they've all been.

all their identities have been removed. Interestingly, these two devices have got almost exactly the same part number on their Magna chip. Um, I Think that's Mdp night. I Can't get focused on the Mdp 1991, but that looks identical.

Something like Mdp 1991, but look underneath. Uh, this is obviously a mosfet because you've got big copper area, big copper area, and then tiny copper track going to the gate. And this one, you've got big copper area on the middle pin and these two outer pins are linked together on this big copper area. Definitely Diode.

Definitely mosfet. Anyway, more evaluation of this thing in a future video. and now this one. I Should be careful, this blade shouldn't I it's it's.

very blunt actually, right? This is this. Oh well. There's some Clues on this little box. 18650 2.0 Type C.

So this is oh yes, that's quite nice, isn't it? Let's get it out of the bag. This is an 18650 cell tester. Um, let's come down there. It's interesting.

You have a power cell which drives the unit and then you have a cell under test and you've got big resistors here which just get hot and waste all the energy in your cell. But I think you can power it through USB type c I Also think you can test something on a USB type-c I Can't remember what the listing said, but let's put a cell in here to Power It Up Now Um, which cells should I use? I Don't think this one's going to work because this one's an elongated one because it's got a little USB micro b socket on it. So I just I think I'll just use some of these blue ones which I think came out of those Wix power tools. What I might do actually is get some rubbishy old Ultra Fire There's an ultra fire I'm not sure if that's protected, don't know as the one that I'm going to test because it'll test quite quickly because they're rubbish, right? Let's have a little play.

So oh, now positive is down the bottom. It says yes, there's a positive and there are two positive symbols there on the PCB So let's get these the right way around. That's a very tight fit. It's a very tight fit.

Goodness. These sockets are a tight fit, right. Switch it on. Oh, lots of nice stuff on there.

it's all in. Chinese I'll try and get it into English Hmm Well, I don't know what I'm doing. Uh, this one switches between three Fields here because that goes blue and then that goes blue. Then you can change that number from three, four, five, six, seven, eight.

Uh, up to about eight I don't know what that means and this obviously starts and stops something because you've got a counter there and then you press it again. Oh oh, that's actually putting some Watts through the resistors. They're probably going to get warm now. uh, and you can stop it like so.

but I need to get it out of Chinese So here's the item on AliExpress Um, 18650 Lithium Battery Capacity Tester Internal resistance meter. You can discharge and charge multiple times. Oh I don't know how you charge because it's not going to charge from the host battery. Is it that must come from the USB I'm guessing if indeed, it does charge.

Yeah, because it does run cycle. Um, 3.84 3.84 I Can't be right. Shipping is 3.89 Is this seven dollars in total? That's extraordinary. Um, that seems quite cheap right now.

a bit further down. it's got a load of stuff here, but it doesn't tell you how to use it, just tells you what it does. But there is this link. uh, Bamber.com gather is it and I went to that and there's a Chinese page.

but there's also an English page. And then there's this section. Language switching and I have managed to language switch. so let's have another look at the unit now right? Uh, the display goes a bit dim after a while.

so uh I think you press it to brighten it up so you've got status stop mode charge. stop at three volts. So I guess if you're in mode discharge. Ah okay, uh no, that just seems to increment.

Maybe you have to cycle around? So let's stop at three volts. Um, that's the number of loop times and this is the mode. So we'll do discharge down to three volts Loop times. So is it this one? Yeah, Loop times I Think you can do up to eight nine so we'll do one and then start.

So it's pulling. uh three? Watts So it's pulling one amp I've got a feeling this might be fixed at one amp. Uh, 3.64 volts and that's falling. So yes, it must be heating these resistors up.

can't feel anything yet. But um yeah, I believe you can Loop this round and do multiple charge and discharge cycles and then get um capacity information which would be here in milliamp hours and here in milliwatt hours. Now my guess is in order to charge this, you'd have to have some USB going into here. Yeah, these resistors are getting warm now.

Oh yeah, quite warm actually. Um so I think when the display goes dim, you can press any button to lighten it up. Probably avoid this button because that's the start stop I think any other button. this one.

What's this one? This changes the data on this field, but of course it doesn't when it's running, so this doesn't seem to do anything so that would be the best one to re-brighten the display. Uh yeah, yeah, this looks like a neat thing, but I need to do some more reading on it. And just because I can I thought I'd do a completely gratuitous thermal imaging shot of the resistors there. I Think what's that? Say yes, that's 62 degrees.

Oh, they're quite hot in their Center aren't they? Yeah, so they're quite warm 62 degrees And so these are today's post bag items now. Big thanks of course to uh, my patrons who support me on Patreon. Uh, that's becoming increasingly important because the advertising rates from Google advertising are just falling through the floor and continued to do so. Um, if you would like to become a patron, that button subscribe that button.

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