Simplest power bank ever?
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- Опубликовано: 2 окт 2024
- This somewhat exaggerated power bank has one of the simplest circuit boards I've seen yet. Just 5 components and the connectors.
To keep the chip's pin count low it uses the arrangement of the charge and output USB sockets in parallel. That means that it has to dip the voltage briefly every couple of seconds to check if a charger has been connected. That results in a very short, but noticeable pulse in the output if a light is connected.
The chip also detects if the load is low and will switch off into a standby mode. Not great for low current loads like low power lights. The one plus feature it has is a very low quiescent current of 11uA when it does go into standby. The stay-on current is 40mA and above.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
www.bigclive.co...
This also keeps the channel independent of RUclips's advertising algorithms allowing it to be a bit more dangerous and naughty.
2600mAh is the lifetime capacity. Dies after third use.
It does come with a lifetime warranty...
It explodes and kills you on the 3rd charge
@@j.cheeverloophole9029 Don't give fanatics any ideas.
@@j.cheeverloophole9029 Then you better check your laptop, Phone, Tablet, etc. because those batteries were created in the same country! Yeah, I know your comment was sarcasm. It does make you think how really safe any of these batteries actually are!
@yehoutube If a Telsa car battery pack goes faulty, well, I will see it from here!!!
The exact same powebank got recalled in The Netherlands for fire hazard....
That was very caring of your brother, checking the candy was ok while you were away
He didn't do a very good job, it looks like most of them got away!
He kept a close eye on the condition by taking frequent samples
What's a 2000mAh rounding error between friends?
A pack of burgers
Maybe it's 2600 micro amps. Which is 2.6 mili amps. In that case you got almost 3 times more than advertised. Bonus!
how did he not mention the fact that the label says "warning do not follow these instructions"
Glad you posted tonight, I got my tranfer case and Transmission pulled out of my truck today, I needed to unwind a bit.
@Mr. Mosby it all went pretty smooth til getting trans off the dam pins were tough.
Our hero, Big Clive, became sour
On false claims of USB power
He put-off his rest
Until he could test
Their true rate of milliamp-hour
Bruh.
wow.
~D A N K P O E T R Y~
"Wanting to hear poems
I came; all I heard was shit
Haikus fucking suck"
~ Sly Clop, Triple X
Don't post poetry
Where you need shit
Keep away from children? It should say “keep away from Clive”😂😂
@Robert Baker How do you manage that? Their parents insist on bringing them out in public!
I love these devices as they are a great way to get free power banks. You buy them off eBay (the ones that are very obviously fake), measure the true capacity, complain to the seller that they sold you a fake item, and the seller gives you a refund so you don't spoil the nice scheme they have going. I've gotten a number of free power banks this way, and because they are coming from scammers I don't feel the least bit guilty! Same applies to 18650 cells and the like. I've often wondered how far you could push the scheme before they give up and start labelling the capacity honestly...like could you build your own DIY powerwall entirely from free scam batteries? Hmm...
We got a good supplier who tried to push us some 1500mAh 18650s as 8000mAh we had never gotten batterys from before but good LEDs,COBs,project boards etc from, not knowing we test all cells on intake & test capacity before DIY/usage (never selling unless genuine samsungs) & they gave us 50pcs of fake marked/wrapped cells so we ended up with a few 1500mAh for torches/projects etc with a full refund (it helps if you can show fakes & they cant argue with pictures/data shown 0-100% charge capacity 🙈🙊)
While I don't have much of a problem with this concept *now*, this line of thinking has made things much harder for consumers. Years ago it was super easy to spot fakes, as they'd always have an absurd capacity rating of >4000mAh (eg those terrible "9900mAh" 18650s that are actually about 500mAh).
While this was a problem for complete strangers to electronics, I was actually quite happy with the situation. Scammer vendors will always exist, you arent going to dispute them all into oblivion, but it meant that anyone who knew anything about the batteries used, could very easily know if a device was fake, with a simple rule (if its under 3500mAh, its probably real, if its over 3500mAh, its definitely fake).
However people buying all the obvious fakes then demanding a refund due to them not meeting the physically impossible capacity rating, even though they knew full well it was fake before buying it, has led such vendors to give their units less absurd fake ratings, like these with 2600mAh. Now it's impossible to distinguish the real ones from the fakes since they'll both have a reasonable sounding capacity, and its only if you actually test them (which far fewer people will do) that you can know if you got duped.
So congrats, you and people like you have helped make the market an absolute shitfest, where you can never know if powerbanks or batteries are fake or not until you receive them and test them yourself. Thanks.
Get over yourself you fucking socialist.
*stares angrily at you... mostly because he didn't think of this scam first*
@@dalehorton7748 This is the whiniest thing I've read in a while
I know I'm not the only one that finds your vidyas oddly calming. My coworker's 10 year old son is a huge fan coincidentally. She said "He's a guy with a big beard and from the U.K. who takes electronic things apart." At that point I knew it was Mr. Clive himself! Inspiring the next gen of tinkerers, and mellowing out lots of people in the process. Cheers.
Great review! These are available as kits from Ali, and I've bought a bag full of those power bank cases. We then recycled "dead" laptop batteries, took out the working cells, and made power banks for the workshop's students :-) They are good enough to charge your phone if no other options are available, or power some small Arduino robots :-)
Perfect second life for old laptop batteries. I’ve got a large collection myself, and they’re definitely perfect for those sorts of applications. [Some of them don’t do well for things like charging phones because the voltage drops heavily at high current, and most 5V output boards I’ve used will cut it off and leave a fair amount of power left when the voltage rebounds]
Is Chinglish, going to replace Esperanto as an international language?
Jes
I love hearing Bigclive read Chinglish.
Engrish
How hilariously bad Engrish is written at East Asian companies:
Manager: "Hey, you! You said you know English (or went to conversation lessons), go write the copy for the English manual and packaging. What? Hire a native speaker? Do you have any idea how much that would cost compared to you doing it for free? Wait, did I say that out loud?"
Japanese guy: OMG OMG I have no idea what I'm doing wait I'll just slap some English words together... (note: this is also how random English words end up in Japanese songs)
Chinese guy: Eh, I'll run it through this translation site I found on Baidu. No one's gonna know the difference.
@@MMuraseofSandvich from my experience living in China, Baidu translate is actually low key better than Google's for Chinese and english
Remember to translate from 5v to the 3.7/3.6 nominal for judging capacity given in mAh. They always quote what is written on the cell.
Going to assume the worst case scenarios and be generous with the assumptions.
700mA @ 5V means less than 980mA @ 3.6V
Assuming 20% power loss due to conversion, would mean less than 1230mA from the battery.
Assuming 20% tolerance on the capacity of the battery would mean the battery could be labelled as no more than 1540mA.
@@n-steam and then you double that number as the cell sees the maH going in when charging and then again going out when discharging. Boom 😁
@Против Глобал Pardon my ignorance, but how do you know it is a linear charger? Presence of an inductor suggests that bucking is intended. Unless it is meant for some kind of filtering which I doubt.
@Против Глобал Perhaps my basic physics is rusty here but if the input is at 3.6V and the output is at 5V even with a 100% efficiency in the output circuit the current of the output must be lower than the input or the power output would exceed the power input, the law of conservation of energy says no dice on this one you can't output 0.5W (100mA@5V) from a 0.36W (100mA@3.6V) input either the output current would have to lower or you need to draw more current from the battery to supply the missing joules of energy here. Though this is if one is measuring it by measuring the discharge capacity of the battery I guess are you only talking about if you measure the charge input to calculate the mAh value? So I guess it does depend if you are measuring the raw charge input or the real world usable capacity (output) though I would expect marketing to favour the former as thermodynamics guarantees the usable output capacity will always be lower due to losses in the energy conversions.
I bought one of these a while ago from a pound store - when I took it apart it had a spring holder and the 18650 wasn't soldered - meaning I could remove the cell and use the bank as a charger. Sadly when I went back to buy some more they all had the cell soldered in place. Yes they can be bought online, but the pound store ones where a cheaper option.
I have a bunch of VTC5A's that need a good home. These cases look like a nice place.
Amazing the 6 pin chip is almost as small as those 2 little capacitors.
Especially since it’s sinking 1V or so when charging. I can’t see it taking more than 150mA or so.
How you doin that? How how you doin that?
cute suit head
@@Scrogan Put a scope on the inductor. I wouldn't be surprised if it's in fact operating as a buck converter during charging.
@@Re_Kitty Thanks!
No no, Clive, 2600 mAh is the cumulative total you are gonna ever get from that before it craps out alltogether.
HAAHAA
Your teaching style is excellent. Thanks for showing us. I wish a teacher at school could have explained using your technique, it took me years later to catch up because teachers at the time seemed to me to make this subject hard to understand. I did go to school in the 70’s though, so the facility to photograph and blow up an image wasn’t readily or cheaply available. The tools we now have at our disposal to aid teaching one another new skills demonstrate that we all have something to share and all of us should work together.
Thanks again.
NOTAFULLUN
I don't think I have ever wanting to have a drink with anyone else more. Love ya BC!!!
Chineseum Landfillium + HONEST Amp Hour quotes.... Are you having a laugh Clive?
Simple, elegant, and functional.
Well, two out of three isn't bad.
They sell these at your favourite shop (Poundland). I've got a couple and have put a decent recycled 18650 cell in each (~2000 mAh recovered from knackered hoverboard battery). It's a handy case/PCB and will charge my phone from near zero. Also handy to slot in one of those USB torch heads you've featured previously.
Lmao your intros always make me laugh cause I forget to turn off the bass boost half the time
Greetings from Halle, Germany. Nice to see Halloren on your Channel! If you need more, ask me!
That was funny. The bird looks like it had an eye when you set it down on the picture!
Wait, what?!? "Do not disassemble"?!? Holy shit, Number Five confirmed...! Hang in there, little buddy...!
You need to do the fake micro SD cards, they're everywhere
Yeah, one of my friends was unaware that fakes existed and so was confused that her phone kept losing stuff.
64gb printed on it, the actual capacity was about 512mb.
I got this exact same power bank as a welcome gift for opening a bank account. I wonder how much they care about their customers. Haven't really used it anyway.
Wow that is a low component count, even lower than my all time worst power bank, which entirely lacked any charging logic but rather just stuck a diode to drop the voltage...
I wonder, if you plugged this into a device with OTG USB capability such as an Android phone would it be possible that the device would start charging the power bank rather than vice-versa?
Yes it would. The cables are wired differently, so if you used a normal USB cable the phone would charge from the power bank, but if you used an OTG cable the power bank would charge from the phone. I had to draw little direction arrows on the cables I carry around with me so I could remember which way the power would flow for each cable.
OTG cable?
Berkeloid That wiring is mostly for the data, controlling which end is the master. There is an increasing interest in having phones charge while acting as data master for headphones or speakers.
@@franglish9265 en.wikipedia.org/wiki/USB_On-The-Go
My wife has a tiny electric fan which is powered via USB-C from her phone. Clearly there's 5 volts coming out of the port. It seems like this power bank with it's simple circuitry would see that and start charging itself rather than charging the phone.
Those jelly candies bring forward a strange nostalgia, almost as if I've enjoyed them before, but as far as I know, Until now, I've never seen them before in my life.
This is my guess before watching the vid, 800mah
The structure of the candy was more complex than the power bank! :-D
I bought a few of these at a local electronic stores. They look exactly the same as these. Its rated for 2200mah...and suprisngly, they WERE :O
I verified it by opening it up and removing the 18650 and externally charging it at 500ma since thats the max charge rate the pcb board can do. And it definitely does supply 2.1 amps. I use these small power banks to power my camera on my motorcycle helmet when that battery dies. I further modded mines with a battery level bar
I picked up a couple of these for £3 each. Mostly for smaller electronics projects. Mine are all the same package but a bit more complicated circuit, and the battery is not soldered but in a socket.
Therefor I can use them as chergers for 18650's
I used to have a rule of thumb about power banks...they only have about 1/2 the stated capacity.
Now that China is outputting so many knockoffs they only have 1/4 to 1/5 the rating listed.
Sad state of affairs that you can't even get half of the amount anymore.
A chinese battery being tested with a chinese meter and chinese load. What could go wrong?
My mom bought us 3 of these in the local Chinese shop. They all worked :D
Ofc the capacity was not high but 1/3 phone charge is useful.
Handy for a backup battery topper on USB charged bike lights, maybe? I much prefer my Mobi brand pack - manages 2+ full recharges on my iphone and can even charge it faster than Messenger on a video call can drain it (older phone, video calls can drain a full charge in half an hour on 4G)
Hi Clive, have you seen the little Dekton digital voltage testers in Poundland? I was wondering how safe they are. I think they're like a posher version of the old screwdriver mains testers that you stick your finder on the end, except these have a digital display, can test from 12v to 240v and can test AC and DC. There's also an interesting warning to NOT touch both the DC and AC test electrodes at the same time.
I like to use power banks to run a single led so I will not trip over things at night, but I cannot seem to find one that will stay on with that tiny current draw.
I got a power bank in the same case for some years now. It's working fine for an emergency backup that I rarealy use. But mine also got a second LED in blue that lights up when the power bank is being charged.
The king of innuendo.. the master of the double entendre.. You're mad.. haha :)
I remember getting a couple of cheap power banks from the local cable company and I always wondered if they were any good.
its interesting if you notice that the "2600 mAh" label seems to be put on by someone else besides the original package manufacturer. i wouldn't be surprised if the owner of the shop or someone slightly above him in the supply chain just used a label maker and slapped a bunch of those labels on them. the original manufacturer leaves it blank for you to label (or lie about it) it yourself, i guess.
When you said “I shall pause and we shall reverse engineer this” for some reason I thought you were to reverse engineer the candy.
i love purple, you should get purple more often
Why one is Orange. I like Orange it is easy to see.
Give the seller a one star review. The reason there's so many scammers on eBay is because people doesn't give feedback if they get scammed..
5:52 - "...he visited the house to check the candy was ok." Hmm...I guess there are people on the Isle of Man that break into houses and only steal your candy. BC needs to get a safe just for his candy. ;)
What was the actual battery mAh capacity which is printed on it.
Hi Clive, don't forget the mentioned capacity is often measured at 3.7V and not 5V, including DC-DC conversion loss, this could mess up numbers.
I always refer to the capacity of the cell inside which is often the stated capacity on the packaging of real units.
It's good to have standards, even if they are low.
Searching on the number on the circuit board, I came up with a Russian unit that looks exactly like this one- it's rated at 3.7v.
Laura Harris Lithium cells are 3.7V nominally.
He's got a video about how he tests power banks that explains all this. He is testing them right. Kinda wonder if he should link that in every one of these videos to avoid a third of the comments being "you tested wrong, etc"
Would be interesting if you swaped out the orginal 18650 battery cell with a proper 18650 cell that actually has a capacity of like 3400mah.. Would you kill the circut at max load?
no , it so problem, but the loadingtime will be longer
Always interesting your videos. But i hope one day you are going to buy an oscilloscope. So you can test the output voltage on spikes and so when you put a load on. But keep on the good work.
hi, I have been given a dead powerbank, under inspection, I think the battery died after just a few charges. I replace with my one of the laptop battery. I also found the battery discharge quite bad drain through the circuit board (not like yours) I replaced with another board I bought from ebay (2 boards for 99p). So only good thing is just the case. Mine all work with 3,000mah battery and very low drain, it can discharge about 1Ah. Cost me I guess 80p and I am happy with it.
I have one of these. The body isn't actually meant to work like that - they're supposed to have terminals that slot in those mounting points, and you can swap the cell out as you want. Mine is like that - I bought it from the "Muy Mucho" chain in Madrid (paid all of, like, €2 for it) and while the cell is moderately shitty it still holds close to 2Ah. I was quite surprised when I opened it up and the 18650 just fell out, allowing me to insert a NCR18650B 3.4Ah in its place and have a surprisingly capable tiny powerbank.
Thats ALMOST the same circuit you find in the cheap iphone charge cables that damage the tristar charge IC minus one of the ICs 🤔might be something worth investigation....🙈🙊 (there is now 7 versions of the cable circuits including original manufacturer's specifications)😂😧
keep away from children, if only jimmy saville read the instructions
Every friggin time those annoying TV ads say “Always keep away from children” me and my mates make the same joke.
I wonder if by changing the value of those two capacitors you could manipulate the low and high current thresholds. Would be an interesting experiment! I'm going to have to look around and see if I can't find one of those to try it.
I think I bought tiny "charge" boards on ebay (or amazon) that worked with a single 18650... :). As always, entertaining "review"!
The current rating also seems be to 1/2 to 3/4 if we are following the USB specification.
@Bigclivedotcom I hope you would consider making a video on how you are taking and making your photos. They are so clear and the lighting is great. Clear photos in lieu of a service manual is a great tool for troubleshooting as you've illustrated in many of your videos.
What concerns me more than inflated capacity is inflated amp rating. Running an 18650 at ~21 amps because it says it's rated for "25-35" amps when it's actually only 10 amps is just plain scary. Some battery rewrappers are taking the manufacturers pulse rating (which means pretty much nothing) and claiming it's the CDR.
Efest is pretty bad at that. Their Samsung 30Q wrapper says 35A when the cell is only rated 15A continuous. You can definitely get away with quite a few extra amps on the rating, but advertising it as such is wreckless and misleading. Especially considering how little a lot of people know about li-ion safety.
@@william_2610 Ampking too. 20 amp cells with "35 - 45 amps" written on the wrap. It's insane because those are sold in vape stores. Most people with regulated devices never bother to learn any ohms law or battery safety/maintenance. With massively inflated ratings, they're gonna do themselves some damage one day.
@@archgirl They are already doing themselves damage, the fda (for Americans) has a page devoted to vape battery explosions. The following site has a compiled list of reported explosions;
ecigone.com/featured/e-cigarette-explosions-comprehensive-list/
@@alexb.1320 It's just a shame that the explosions get attributed to vaping instead of human error with regards to li-ion batteries. These batteries will vent and go into thermal runaway in any device when misused, but the reports always blame vaping instead of the person incorrectly maintaining battery safety.
natural selection boosting devices ;)
what's a missing hand, teeth and half your face......
"Keep away from children"
Well, you've failed that job- Clive's got ahold of it and is already ripping it to bits.
At least we won’t have to worry about him sticking a fork into an outlet- wait...
The IC is a HotChip HT4927U. Official limit is 0.7A which coincides with the point at which your test drops below the rated 5V output.
Datasheet is on their site, google finds it.
Those power banks are great as emergency lights.
Leaving them plugged in to charger with led lamp plugged in. When power fails less turn on.
I have one of these power banks given from a relative but the internal design is slightly different from this video: The purple li-ion battery is not soldered/weld to the board but instead tension fit like a AA battery socket, there is two LED for each color and the Hotchip HT4928S occupies the U1 section.
Aaah, Clive you should have addressed one of the package cut-out window 🤣😂 'suggestive'
strangely, he wasn't tempted to write "wil" before the "lies"
To summarize, "I shall just pop that in the bin".
I bought a few of these an soldered 5 or 6 batterys together an soldered em all to 1 of the boards.. works ok think i get 5000mah
Yep ive done that too...much better now. :)
@@100roberthenry charges slow but works only bought em to try it out
@@CrownJewelzMusicGroup yeah it is slow. But more useful when charged..
@@100roberthenry i use it on my bike it charges off my dynamo wheel...every mile i pedal i get 1% charge lol
@@CrownJewelzMusicGroup excellent....ive been charging mine indoors with a solar panel in my window....i charge up all kinds of stuff....i never buy batts now...cool stuff.
Could you do a video (maybe you have and I missed if so, sorry) about how to keep power banks from cutting off so as to be able to use them with with low power devices like pyboards and arduinos? Cheers.
What's up with the toilet-flush-handle-shaped hole in the packaging? (00:15)
I was given a couple of those. They came from Poundland. One had about 10% of the claimed output capacity, and the other had about 12.5%. On second recharge, both cells delivered slightly less power before they shut down. The cells seem to be reclaimed at the end of life, or else factory rejects. Thanks Clive.
Hey man love your vids but it’d be nice if you could upgrade your lighting a little bit :)
no comment on how well designed the bank was with the leads soldered directly to the battery?
My response is the product has broken English on the box and that is just embarrassing with broken English I made a video on Knock off products on my channel a long time ago with products that have broken English
These are the same as the Poundland ones, just different colours
To be perfectly fair, since when have any of these Chinese made electronic power banks actually delivered what they claim? Sure, they lie, but even the name brands can lie (or at least stretch the truth heavily).
Lithium Ion cells from dodgy chinese supplies are 99% e-waste. That's why it's much better to just buy DIY powerbank case with the circuit and get a big 3000+ mAh cell from good source. Much cheaper that way.
My husband and I adore your naughtiness, Clive.
These are the same as the Poundland ones, just different colours
Very honest of the shop to write "Lies" 😂😂😂
If definitely buy one if I saw that the shop had written that on it :)
Comments remind me interesting open letter to Samsung I'd seen (about trying to buy a genuine branded cell), which I've just found again and pasted here..
The situation at present is riduclous. A thriving counterfeting industry based in Shengzen exists. They clone a Samsung battery in every way except achieve the authentic Samsung battery performance. The consumer sees a mA/hr number on the label but it's counterfeit as the printed Samsung logo.
Now if the smartphone displays battery status in mA/hrs actual ENERGY LEVEL instead of the usual ''percentage fill level'' , then showing this mA/hrs would stamp out the problem of counterfeiting overnight. You would give the consumer the tool to police the counterfeiting industry from their end of the supply chain by showing them the quantity of stored energy they have after they fully charged their device.
Meanwhile only a small percentage of people know what mA/hrs is and have the means to measure it. You will find that this perctentage closely corresponds to the amount of negative feedback received by Ebay seller of ‘geniuine Samsung battery’. This sector of people is growing. These people exploit the present situation to obtain a lifetime’s supply of free batteries. They do this buying Samsung-branded batteries (including 18650), use their equipment to prove they bought a counterfeit, demand a refund and then keep the ‘Samsung’ batteries. In rare cases they will receive an authentic battery so these people win both ways.
In this age of climate change concerns the consumer is becoming ever more concious of the concept of energy level. They have a power meter in the home showing watts.
I am saying please make your new phones indicate energy level (not fill level) and enable the consumer to be aware and stamp out the replacement battery counterfeiting industry from their end of the supply chain.
Thanks for your great videos Clive. Thank-you also for NOT Masticating on RUclips. I'm fairly broad minded about most things, but masticating on an open forum (viewable by women and children and small furry creatures from Alpha Centauri) would be just a bit too much to swallow. Cheers
I wonder how soon they just won't bother with a circuit and will just put the battery directly to the USB connectors, after all it'd save them pennies on the pound, and as for the end user, they wouldn't really give monkeys... :P
I got one that looks similar but has a MP3401A for the chip. got it at Dollorama
I just buy the case, it's pretty good for 5V projects if you put a 18650 in it.
But it says 2600mAh on the box... Who to believe.
one problem with measuring in mAh... the battery is 3,6V and in powerbank you want 5V. So you need to boost it.... but when boosting on the input you need more current than you get on the output... hence you get less current but in reality battery gave it away. In math terms it would be proper to measure it in watts. 5V times 654mAh(measured in video) = 3270mW then when you divide it by battery voltage you get actual battery mAh. 3270mW / 3.6V = 908mAh... still less than advertised but this is the proper method for powerbanks.
I bought a diffrent powerbank and it was also advertised with 2600 mah but i tested it and it only had 1400 mah 😧😖
They sell these ones in Poundland 👍
The Poundland ones only claim 1200 mAH, I have 2 and both test out to around 750 mAH so either Poundland's buyers do a better job or I got lucky with whichever rip-off battery vendor the manufacturer was using that week.
what about hooking it up to a scope to see the pulsing of how it checks for a voltage?
Yes. Scope please to show the detection logic!
Go for it!
my rule of thumb would be
volume of aa (mignon) lithium battery equals about 750 to 1000 (depending on brand) mAh minus 30% of charging loss.
Scammers have been at this since before lithium batteries existed. I once came acrosss a suspiciously lighweight "D" cell, and on tearing it open found a AA battery in a D-sized plastic cylinder.
the question about power banks I've looked on the internet and cannot find the answer I'm looking for a simple answer I bought a USB power bank and it has adjustable to the mobile phone device current . does that only work that system when I have the tablet on and doesn't work with charger only cable thank you very much for reading my comment and I subscribe to your channel it's very good thank you bye I'm talking about theI'm talking about the amps output not the voltage thanks the make of charger is in otl. T e c h i m o l o g y s I bought it from Argos and they come with different types like SpongeBob superman hello kitty written on them and that's it really thanks
You can buy these on eBay without a battery (with springs) for about a dollar.
Then just shove in a known good cell.
I once bought some powerbank holders (without the cells), shoved some decent salvaged cells in them, then sold them back on.
The best 18650 cell is 3600mah, so a very good 70% (never seen one) conversion rate only gets you 2520mah.
I think you mean highest capacity, not necessarily the best... it depends on the use case.
bigclive i wonder why power bank manufacturers wont sell replacement cables?i mean they 0.2cm cables..
are manufacturers hoping that then your cable fails u buy instead new power bank instead finding new cable??its pain in the ass to find theys cheap cables.
So this is one of the rare ones that can charge & pass-through charge a device simultaneously? 🤔
These look like the Poundland power banks you've tested before.
Might I inquire as to where I would get such a handy load generator? Thank you.
eBay. USB load tester.
@@bigclivedotcom Thank you very much!
When did it become okay and legal to sell items under blatant lies? These guys need to be taken to jail for fraud...mostly because what they are doing is hella annoying.