Inside a Poundland 9V alkaline battery. (Check polarity of cells if re-using!)
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- Опубликовано: 25 авг 2024
- If you repurpose the internal cells then check polarity. The shell may be positive and pip negative.
Someone recently asked if they could use the internal cells that make up a 9V battery as an alternative to AAAA sized cells. Well there's only one way to find out. Let's open one and measure them.
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By the way, the easiest way to tell whether a 9V battery contains 6 "AAAA" cells is whether it's marked as such. Those sorta-AAAA cells are actually called LR61 cells, and the 9V batteries containing them are generally marked as "6LR61" on the shell.
Thundertactics ah didn't know that's what it stood for, they actually have several different codes depending on the make, but most people still refer to them as 'PP3' which was first used by Ever Ready decades ago, PP actually stood for Power Pack.
And 6F22 means what?
F quite simply means "flat", 6F22 means a stack of 6 flat cells. (Similarly, the R in 6LR61 stands for "round".) The absence of any other letters means it's zinc-carbon. Conversely, the L in 6LR61 means it's alkaline.
The last bit (22 and 61) is the IEC 60086 standardized size code, which is arcane knowledge with little rhyme or reason to it.
Thanks for the tip!! Thats a great way to know whats inside! I usually only tear the up once they are dead to recover a "free" 9v battery clip :-D
@@DryLog420 As do I, but every one I've ever done that with has been metal cased, not plastic. The most common use I know of for AAAA cells is in laser pointers.
In the mid 1980s, we used to fire off model rockets in the park. There was a translucent plastic cone on the rocket, and I got the idea to put a 6V mini Christmas light in the cone, but couldn't fit a 9V battery inside (too wide), I cut an Energizer battery apart and used four of the sub-AAAA cells arranged in a 2x2 square and it fit perfectly. We launched this rocket at night, and a green glow shot up into the sky, disappeared, and then came down into a nearby forest. Recovered, and used several times until it was lost in a river.
North Bay area ?
Back in the '60s we used to take bottle rockets and throw them by hand trying to make it across the river. If they lit up at the right time, you would make it across the river, but if the bottle rocket had already started pointing downwards when it lit off, it would go into the water and explode at some depth under the surface. At night, that equaled a big glowing spot in the water with a muffled thud for an explosive sign.
I did nearly the same thing with an Estes "Big Bertha"
I used to have a Big Bertha but it got stuck in a tree near a run of high tension power lines on it's maiden voyage!
Now if the kids got off their phones went to the park and tried to launch rockets they'd come home with terrorism charges.
Speaking of rechargeable 9V NiCd batteries, growing up in the 80s I always used the Gould brand NiCd 9V batteries because they were one of the few brands that actually produced a 7 cell 8.4V NiCd battery. They tended to work much better in many electronics expecting a 9V battery since 8.4V is much closer to the expected 9V than the typical 7.2V NiCd batteries were.
Interesting. As a child I used to investigate how things worked and these used to be a stack of flat rectangular plates of carbon soaked in electrolyte alternating with metal plates. The larger 9V batteries contained cells wired together in series like this. Batteries and cells are technically much better now and this wouldn’t leak as easily and would be safer if someone broke into it like you just did.
In america they aren't so hard to come by. Since Microsoft started using the AAAA batteries for their pens, someone had to start carrying them more so generally Batteries+ is our go to for em.
In the past I've pulled absolutely perfect AAAAs out of a 9V battery, complete with pip on + and retail printed case. At the time, really expensive consumer electronics remotes often used AAAAs often co-branded and with "Use only Rippenoff GmbH brand battery" warnings everywhere.
I'm really disappointed that Poundland isn't the name of a brothel
Banggood isn't either :(
WHAT
Or a toilet, loo! Thanks for the spelling correction. I had a friend who used to say, “I have to go drop a pound.” Not sure if this was just my friends saying or is used elsewhere.
PlanePreacher - *loo* is the correct spelling (if you’re referring to the “omg, those airport tacos are running right through me, where’s the *loo?”* deal).
orion khan thanks, I will correct!
AAAAs are used in "active capacitive digitizer" style drawing pens.
These are best known by either their brand name Ntrig, or by their most prolific use in modern Surface devices since the Surface 3 line.
Given the relatively long service life of the AAA battery in one of these units, one 9v battery should be able to serve the predicted service life of your Surface computer. :D
Genuinely didnt know AAAA existed
Tom Williams Productions Ever hear about E and J size?
Redlock oh god, don't get me started on E and J size
Oh there are plenty others as well. Got used to all kinds of weird cell sizes when i worked in camera shop.
Tom Williams Productions damn i thought that is normal AAA BATTERY
They're getting a little more common now, Microsoft Surface tablet pens take AAAA batteries.
Duracell and energizer batteries have the same AAAA cells. We used them in the army to run cd players and radios ,when batteries were in short supply.
Use a chapstick cylinder to make them fit tite for AA size.
Your attitude to safety is a healthy contrast from the usual UK paranoia about power. In the QI x-mas special, the host was nervous about touching the bare ends of a SPEAKER wire, and here you are calmly cutting away the case on an alkaline battery, unrolling the cathode/anode of a lithium cell (that was shaped like a AA battery), or intentionally running electric current through your body.
I recently took apart an old-nearly-depleted 9V battery, the inside was corroded and full of battery fluid residue and after a short while one of the cells exploded with a big bang as the negative terminal flew across the table leaving particles of the innards everywhere.
I had a bluetooth headset many years ago that used AAAA batteries and since they were hard to find, I would tear apart 9-Volt batteries like you did here and use the cells from that. I found, as you did, that the cells that came out of the 9-Volt battery were a little shorter than true AAAA cells and I had to make a little ball of solder and put it at one end of the battery compartment to make up the difference.
i remember tearing open a 9v battery when i was a kid and it was just filled with black gunk! what is this witchcraft!?
Mith of bin a carbon zinc or some carbon chemistry of some sort, I remember taking some apart like you describe when I was younger
outseeker that would have been a normal zinc carbon battery.
A zinc-carbon cell still has a potential of 1.5v/cell. Outseeker must have destroyed the internal separators in his youthful passion.
the reason they are shorter is they dont have the top 'pip' as on proper AAAA's, but 'tagged' , its similar with tagged nicads/nimh's..the actual 'cell' is the same size, just pipless...
Wow ! I had no idea 9 volt batteries had 6 little cells inside ....this video has been enlightening
not all of them do, Duracells don't for example
they ALL have 6 cells in, they have to as no single cell is 9v, just that some(most?) have flat cells some have the AAAA 'rod' type...
I meant that most don't have the cylindrical cells , Yes most have 6 flat cells they hold a higher capacity??? Most cheap 9v use the cylindrical cells , since they are cheaper and a lower capacity than flat cells.
dunno whether its the cheaper ones using rod cells or 'flat' type, but i personally have never yet come across one with rod cells in ,... yet... i sometimes open up dud ones to pinch the top connector plate 😉
the cylindrical type cell have a slightly lower capacity by 100 - 200 Mah or so , so they are cheaper.
Maybe the 2.5mm difference is the nub on top of a normal AAAA?
Jim Fortune that probably true
Yes - because these alkaline cells are case positive and tip negative, when packaged as AAAA they need to put a tougher insulation around the case to prevent the cell shorting against the sides of the cell holder (hence the .3mm narrower width) and also put a flat plate on the tip to make the negative contact, as well as a nub on the base. That would easily take up 2.5mm of length.
So these are basically unpackaged AAAA cells.
it is, proper AAAAs have a top 'pip'
The top of the 9V battery is handy for using as a connector for batteries in gadgets. Never throw anything good away, is the tinkerer's motto.
Be warned that not all 9V batteries have the 6 AAAA cells inside. Some have a pile-like stack of flat rectangular cells instead. EEVblog made an interesting video about it: ruclips.net/video/c9JGfoLxVCo/видео.html
Are those still alkaline? I've always thought that 6f22 are supposed to be zinc batteries and 6lr61 are alkaline like this one.
The 9V alkaline that I disassembled also had the stacked rectangular cells.
I remember those stacked cells when I opened one as a kid about a hundred years ago. Short circuit current was very low, used mainly as a transistor radio battery. Woolworth was always my supply of bulbs (lamps) and battery's.
Clive mentions that about one he opened at the start, actually.
Maybe it's an Australian thing but I recently opened both an Energizer and a Duracell 9v alkaline batteries and they both had the stacked flat rectangular cells. I have never opened any that have the 6 AAAA cells.
I think the shell is always positive on alkalines - certainly all the ones I've taken apart. presumably because electrochemistry.
ughhhh
it is ..
And negative on zinc carbon/chloride cells
I can say with certainty that the casing of Energizer AA NIMH batteries is negative as well. I just tore one apart to be sure.
i think its only alkalines that are 'can positive', and all others 'can negative' ..????
Cheers Clive on this fine Saturday, it warmed up to 75 dungerees yesterday. Here in Kansas.
== 24°C
Thank you for doing this this is very clever I guess people don't have the time to do something like this but you've educated us as I do buy a lot of batteries from Poundland so I hope that they are safe thank you
It would be interesting to see a video where you test different one time use batteries (Duracell, Energizer and other most popular brands) - check their capacity on low current discharge, high current discharge, take them apart etc.
check out project farm. He has done exactly that.
Nothing else in life quite gives me the same pleasure as taking things apart :-)
I love that too. Putting it all back together often gets shoved aside into the "too hard basket" lol
unlost117 YUUUUUP my too hard basket turned into a too hard warehouse
At least we got parts :)
yep started at 4 or 5 years old with the house phone. I was not popular ; -) and never stopped.
I found an old mower engine in a disused quarry shed, stripped it down, cleaned it, and got it running when I was 7
If you're stupid like me, be careful no to separate the cells by twisting them. The cells can pop open and spray the contents into your eye.
Free eye bath? Surely this is a good thing?
In the 1980s, the 9V batteries had 6 little flat cells in them, stacked on top of each other, when removed, they looked not unlike large indigestion tablets. Obviously, a wire ran from the bottom of the stack to the negative connection on the top.
Presumably making them out of AAAA cells is cheaper, if the factory is already making AAAA cells.
In the 1970s, I worked in an electronics shop and remember selling batteries for portable valve radios. Can't remember the numbers now, but one was 6V for the heaters and the other 90V for the HT (60 cells, I suppose).
A very long time ago Motorola devices used to be my main source for AAAAs. Black and orange labelling non-flat top cells always fit the bill then suddenly AAAAs just stopped getting utilized.
I've never see these ganged cells sleeved before. They've always been bare cells when I found them in 9V, but it's been quite a long while since I've needed to dig through one for quasi-AAAA cells.
Hmmm, interesting. I once opened an unbranded 9v battery, and it had 6 button cells inside, arranged in 2 stacks. It was probably easier for that manufacturer to find fitting button cells, but i doubt the space usage is as optimal.
They didn't look like that in the early 70s
My my how batteries have moved on
Keep up the good work
Energizer batteries are good as they use compression fit to connect six totally loose cells. (unless you WANT the solder-tags)
"Assult on Battery" ? :-D
Battery battery...
I've been pulling these out for years for my Dell Tablet Stylus which needs AAAA.
The key is to hacksaw the end off a genuine AAAA and fill the inside of the dimple with solder, then sand it flat. You can then just stick that bit onto the top of these and shove it into the stylus.. works perfectly and gives it the extra ~2mm..
The other poundland batteries (Sony and the Non Alkaline kodak's, are no good. they have the flat 6 packs of cells stacked up.. only these Alkaline ones work.
If you use a bit of sellotape round the top to stick the new cap down you are less likely to loose it when you forget you've frankensteined the battery and open the pen outside.
I have a Microsoft Surface Book, and the Surface Pen (the stylus that comes with it) uses a AAAA cell for the battery. In the 3 years I've had it, I had to change the battery only twice, so I typically have plenty of time to find replacements, but they are very difficult to find. I think I found a pair of them at Home Depot (a hardware store) once, but it seems they aren't a commonly sold item. I do usually have some 9V batteries around though, so I might have to use one of those in a pinch some day.
I have taken 9V batteries apart before. The contacts on the top work very well as a cheap interface to connect a 9V battery to for projects. The contacts snap right to the top of another 9V battery (shorting it out if you don't take it apart first), so it's a really easy way to connect wires to it without having to buy any special parts. Makes a great easy 9 volt supply.
That was the last thing I expected to see, Clive. Like you, I thought it was going to be a stack of those square button-type cells. Interesting.
I was expecting a metal case also. Turned a case into a quiet speaker using the focusing bit from an optical drive.
Quadruple A batteries are readily available in The Netherlands (online), although I've never seen any product that uses them.
Never expected to see aaaa batteries in a 9 volt package. I'm used to seeing the old lozenge shaped and stacked pieces.
Did this a few years back and used them in a AAA remote control. Had to wrap the cells a few times with electrical tape and I can't remember what I used for a spacer. Maybe it was a pencil eraser wrapped up in aluminum foil?
Those do work great in place of AAAA batteries. They can be hard to find, but Energizer has em. I've cut 9v (pp3) batteries open for years. Just have to cut the links right in middle so they can fold over on each end to fit good. The thing is, polarity is OPPOSITE of what you would think! Just double check before using in something! Here in U.S., a 4pk of AAAA's are about $8-10... and cutting open Any cheap "Store Brand" 9v will cost ya maybe 2 bucks! Much cheaper, and ya have spares! (I have seen some where smaller cells were not insulated, just f.y.i.) 🔋♻👍
The Durecell copper top 9V has AAAA batteries in it too. But watch out, the top that would normally be positive, is negative, & the bottom is positive. So to use them in place of AAAA cells you have to put them in backwards. Those cells in the video might also have their polarity reversed.
They did. I noted that in the description.
I actually use the 4AAAA batteries found in these 9v to power old (Ericsson GA628 for example) cellular phones. It's simpler and cheaper to do this to keep my collection functional rather than bothering with actual batteries, plus, no charging. Just a few solder points here and there and i'm done.
FYI most of these worked with 3AAA batteries but the smaller package of the 4AAAA makes it easier to pack these back in when you don't want to glue the battery container again.
Energizers do seem to be a pretty good source of AAAAs... can't say the same for Eveready, though, as it looked like the inside of a standard alkaline battery.
You mentioned that you are surprised the cells are sleeved at the end of the video. Of course they are, since they are wired in series and the outside can is usually at the potential of one of the electrodes, so if you packed a bunch of un-sleeved cells together you would be shorting some out.
I thought there might have been sheets of material inside separating them. Sleeved is definitely easier.
I used to recharge ordinary 9v batteries for my guitar treble booster back in the late 70's using my dads car battery charger. They were the ones with individual stacked cells and it worked. These days do not try this. The manufacturers are ahead of the game of recharging non rechargables.
Almost every pb3 I've taken apart was constructed differently. Mostly they are stacked together cells, covered in a plastic shell. unable to get individual cells.
yes some are stacks of rectangular cells, certainly ones made by varta are
Heavy-duty (i.e. zinc-carbon, acidic chemistry) 9V batteries use horizontally stacked cells. Most alkaline batteries use the 6 unpackaged AAAA cells, although there are some alkaline batteries that use the flat cells.
Robert Backhaus the vast majority of alkaline use the flat cells. They’re cheaper to make, by not requiring 6 metal cans. On the other hand the AAAA style can be made mostly on the standard AA/AAA production lines.
Look for the correct magic word '6LR61' on the package. Any other name should indicate a stacked battery of flat cells. That's assuming that you don't buy no-name fakes. Kodak are reliable, but I've used other brands. In the 1970's, we used to partially recharge them with an unfiltered DC supply, originally in defiance of dire warnings on the cases, to see if they really would 'explode or catch fire', but afterwards because it saved money.
My reading of battery mechanical specs is they are maximums (which are only met by rechargeables). It's more useful than specifying a nominal and tolerance. Just make sure your battery spring can take up the 2.5mm slack.
Generally the cells inside the 9v aren't going to have quite the endurance as the actual AAAA batteries
PP3 !! that takes me back , we all remember the PP9 but my mum and dad had a radio that took a PP6 , that were quite rare I think
The name 6LR61 and 6LF22 imply that there is 6 of each cell in the batteri, so if you can find a 9v that only says 6LR61 on the packaging , then it should be one like Clive's
While I can't say about 9V (aka PP3) batteries in the UK, I know most (perhaps all?) Duracell and Energizer 9V batteries in the States are assembled using six LR61 cells. The measurements you took of these cells match up to LR61 measurements.
I had an 9V blow (well, slowly force open) its bottom when it failed and the cells expanded as they failed/corroded, strangely they were stacked coin-cells rather than long single-casing ones. Think it was a cheap alkaline, but not sure.
I think the length mismatch is because of the missing nipple at one end. It's just flat on both sides.
avada nipple!
The 1990s Ever Ready B122 battery uses button cells for the 22 half volts, early ones used layer cells like the zinc carbon, I never knew the pp3 rechargeable ones contained these. I have never taken one apart as yet. Those large 6v lantern batteries contain four F cells in series, I took apart a one made by Nissen used in road lamps an the cells were smaller, E size, the old version of an E cell was a U17 used to power some valve radios, The 3R12 4 half volts batteries contain three U10 cells in series. The best one was a Duracell lantern battery, it had four D cells in series an the Energizer one had the correct F cells in. Quite a few batteries can be hacked to obtain obsolete sizes. I have even made up an old cycle lamp no 800 3v size using two F cells from a lantern battery.
Well that's interesting. I need AAAA cells for my Bluetooth earpiece and have been importing them from China where I get cells of dubious capacity. This would be a much easier source of them and 6 for £1. Well done!
Remember to double check the cell polarity.
There was a video uploaded a few years ago that showed how the old radio batteries from the 50 & 60s era which were something like 6" x 3" x 3" were full of linked AA batteries too.
0:45 - the flat oval button cells sound like the layer cells that used to be found in the old portable radio PP6 and PP9 batteries and probably several others .
kinda weird to see mini batteries in them, maybe the electrochemistry has changed over the years but the last one I opened had 6 tablet batteries stacked upon each other with only a bit of clear plastic speperating them
Wow. I've just subscribed. Very interesting. Excellent sound and brilliant photography.
Thank you Clive.
Some 9v batteries have the stack cells like you was talking about and some have the aaaa cell type it depends on the make and model also sometimes the ceasing will be plastic or metal
If you need good quality rechargeable AAAA NiMH cells for pennies, buy TRONIC 9V rechargeables in Lidl. That's 6 pieces of 200mAh AAAA cells with welded-on solder tabs for about £3.5. Be aware to buy the "Ready to use", low self-discharge type, they sometimes buy them from different OEM, which is supplying standard ones (those are also good quality, but with bigger self-discharge). I used to use them as memory backup batteries for old gear, such as vintage computers and instruments. Also great for small solar garden lights.
Much cheaper than the PCB mountable NiMH backup batteries from big brand names, while having about the same reliabilty, much bigger capacity and lower self-discharge compared to them. If I replace a PCB mounted backup NiMH / NiCd cell, I never solder the new one on the PCB anyway, even if it's the correct package with the same footprint as the original - I solder wires to them, put heatshrink tube on the batteries, and mount them as far from the PCB as possible. I've seen too many PCBs horribly damaged from leaky NiCd and NiMH backup cells.
The TRONIC 9V NiMH can also be slightly leaky after 5-10 years, I have two 9 year old ones, which I still use in my multimeter occasionally, on one of them the rivets of the terminals turned greenish-blue about 3 years ago, so it's slightly leaking its electrolyte - but the DMM still runs for about 2-4 weeks with it (it was about 2 months with the same DMM when the battery was new, and these are NOT the low self-discharge types).
AAAA cells I remember being used in early bluetooth earpieces and also are used in some older tablet pens.
Watch it don't splode on ya, Clive!
That's a good deal. The best 9V battery Dollar Tree sells is a 2-pack of Sunbeam "super heavy duty" carbon zinc cheapos.
I just opened a two pack of Poundland batteries (the Kodak ones). They're just stacked.
I took a couple of them apart probably 20 years ago and it seemed different brands did things differently inside but I remember one of them had individual cells that weren't connected in any way other than contacts inside the 9v casing. I don't remember the brand now.
I use these for powering a Jabra Bluetooth head set for my mobile phone as AAAA retail packs are hard to find even on Ebay!
Alkaline batteries are rechargeable with the correct charger. They can explode when charged with a NiMh charger. I used to do it all the time. They can only be recharged less than ten times before becoming unusable.
I've only ever seen one AAAA battery. It was in a old bluetooth headset before smartphones came out.
Maybe worthy of note about the rechargeable ones: The stack of rectangular/oval cells instead of cylindrical ones is because it makes it possible to use seven of them to get to 8.4V instead of the 7.2V you would otherwise have had.
I have to say I DID think you were going to short that cell out then.
The first I even opend was fillen with around ten stacked bowls of plastic each filled with black stuff.
I had 2 9v batteries in my pocket when I was a kid, they shorted out and got VERY hot while in my pocket.
they can do if they're alkaline or nicad/nimh, zinc chloride or zinc carbon will just go flat!
When I was a kid I plugged two 9V batteries together. They got warm, but didn't blow up. Wasn't alkaline though, that might be different.
andygozzo72 Guitarist's curse. almost all stomp boxes were 9v and I had this happen to me a number of times
Thank goodness its not full of diamonds! :-)
I had a bluetooth earpiece that required a AAAA battery, and I dissected a 9v battery to get one... I didn't need to do any soldering or anything. Worked just fine.
In the U.S., Kodak batteries are quality. And last time I took apart a 9 Volt battery, it wasn't made with Quad A batteries.
Very interesting, thanks for the video/info.
I use the energizer 9V to harvest the AAAA batteries for my surface pen.
Clive, you missed the opportunity in this vid to explain the difference between battery and cell. :)
The Duracell "Industrial" batteries we have at work contain these AAAA cells, I always assumed they were fake due to the fact you could open them up with your fingernails...
Whist useful, I thought that this could have been better - I was hoping that you would have measured the capacity /output against a more expensive version like Duracell?
I took apart a Duracell 9V once and it had the same construction, but no sleeving on the interior cells -- wondering if it's cheaper that way?
Hi Clive, you said you were surprised the cells were sleeved. I couldn’t really place that... Did you expect a different kind of insulation?
Many years ago, I used this method to get AAAA cells for a Fujitsu Stylistic 2300 tablet computer stylus. Worked perfectly! I couldn't find the battery for sale anywhere except WES which is a electronics supplier here in Australia (not sure if they are still around actually...) for a sizable cost.
Strangely enough, the stylus used for the current Microsoft Surface tablet computers use AAAA cells, so I wonder how people are replacing those when they go flat!
They buy the AmazonBasics AAAA battery pack, i suppose?
Siana Gearz in Australia, so the options for Amazon purchases is a bit limited, at least back then anyway
A plastic jacket and an extra plate on the end would bring it up to AAAA dimensions
3:05 is where the bastard spoiled my fun....I was just sitting here waiting for Clive to clamp those shiny metal calipers along the length of the battery... whispering "do it" ... "do it" ... "DO IT"... arrrrrrggh hes taping up one end!
Sleeved for assembly? Unless I'm forgetting something about battery construction, they're sleeved because they must be in order to not short out against each other.
Clive the cells have to be sleeved since they are all packed together and would short out instantly.
*WOW!!!* Never saw a 9v batt like this. I've always got the button cells when I opened them up. Very interesting. You'd think that to manufacture a 9v batt in this manner would be much more expensive, apposed to just making the little biscuit cells...
constructing them this way is cheaper. button cells are pretty hard to make. The cheap ones usually are constructed like that, the most expensive ones tend to use a different construction. thats what i have found anyway.
Having taken a few apart, I remember them just being like little pills of chemicals, surrounded by a waxy substance. I can't see how that would cost more, but then again, I'm not a professional... LOL!
This is what i love about Clive, he takes things to bits, and allows us to *"Discuss"* LOL!
3:06 Not the first time you've caliper'd a battery, eh Clive?
Used one of the flat rechargeables out of a 9v rechargeable PP3 style to replace the memory-backing NiCd in a Fax machine many years ago (probably 25 years back). Far, FAR cheaper than getting the "official" spare part from Pitney-Bowes (and I had a stack of spares should the problem arise again!)
The strangest thing is seeing comments dated a week old when I only just received a notification a minute ago. It only happens on this channel. Anyone else?
When I upload a video I release it to Patreon first. The videos get release on RUclips at the same time as they normally would.
Greetings from Australia Bigclive. I wasn't aware of Patreon cause it's not in your description and you never mention it on your channel. Happy Easter!
They sell those kodaks in normal spanish supermarkets .
I opened one once and found 6 AAAAs in it! Just like this one. Made me question why the just didn't call them Bs!
The vast majority of alkaline 9V I’ve opened have been the stack of flat cells type.
I'm going to have to open some different types.
Another great video. Thanks Clive, I tipped you a tenner for a couple of beers (via PayPal).
Much appreciated, thanks.
I actually once opened a 9V battery and inside, it's a cylinder cell like this but inside that cylinder cell is tons of small button cell
Hmm, that makes absolutely no sense (in regards to voltage and cost) - The V23 and V27 small 12V batteries for remote controls and the like is exactly button cells stacked.
varta are a stck of 6 rectangular cells , not in a metal case
I actually opened your comment and found a bunch of tommyrot inside.
Not at all surprised about the plastic surrounding each cell since the case is at the anode potential which would short to adjacent cells.
Yea I tear them apart all the time when people need to replace their batteries in the surface pens, they are not available here so I sell them replacements from 9 volts for a slight markup
Thank you for that one I've been purchasing quadruple a cells for my laptop stylus . Which are about £5 for 2..
But no more . I'm off to poundland
Double check polarity. Before using. If it's an expensive stylus then I'd recommend using the proper cells.
Why do alkaline batteries never give any sort of mAh rating? Or Wh rating? I never really know how they compare to their rechargeable counterparts.
I use a penlight at work that uses AAAA my favorite flashlight
hello i love your videos and have fixed some thing becouse of watching you but i cannot figer out when reading the resistor bands were do you start