I just wanted to take a minute to appreciate interchangable batteries

I know these are currently out of fashion but I’m still thankful they exist.

Let’s remind ourselves of devices that use(d) these standardized batteries:

  • Toys
  • Digital cameras
  • Torches
  • Gadgets like fans
  • Wireless keyboards
  • TV remotes

Thanks to having a standardized system of batteries,

  • You can use the same battery across several devices. This is a no brainer but it’s very practical.
  • Batteries can charge quicker thanks to being put in a dedicated charger and not being limited by USB cables. (But yes I concede that USB has been updated for faster charging over the years)
  • Devices don’t have down time when their battery is charging. To charge, the battery is removed from the device and can immediately be replaced with a fresh one.
  • You’ll never have to trash a device due to an expired battery. Just buy a replacement. And building on this…
  • Any improvements in future battery technology can be retro-fitted into your existing devices. And there is a high incentive for future improvement, because…
  • An accessible (due to easy replacement) and large (due to many devices) battery market is very attractive to competition.

If you look at the pros I listed, they all happen to be things that would be very useful for electric cars. So I think it would aid the adoption of electric cars if their batteries were standardized too.

guyrocket,
guyrocket avatar

Thank you for this post.

I actively avoid buying things with a built in battery. Long ago I spend a pretty good amount on a rechargeable Braun electric razor. A few years later I had to throw it away because the battery stopped taking a charge and I had no way to replace it. I had a drill with the same fate. There was plenty of life left in these devices but not in their custom batteries.

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

Exactly! It’s a shame that they’re becoming less common as hardware gets enshittified

wjrii,
wjrii avatar

If you're in the US, Ryobi has changed chemistries once or twice, but they haven't changed the voltage or physical format of their batteries for 20+ years.

B0rax,

The batteries in Braun razors are replaceable. They even sell those. It’s not terribly difficult, but you need basic solder skills.

Usernameblankface,
Usernameblankface avatar

I've pulled one of those wireless trimmers apart when it quit working. I found a rechargeable AA battery soldered in there.

Bobbinapples,

I refuse to buy cordless powertools. I know it's not exactly the same as built-in batteries, but In their short existence, I have already seen proprietary rechargeable batteries become discontinued (My mom wanted to get an extra battery for a handheld vacuum, couldn't find the battery by itself, so bought what she thought was the same model; nope, they changed the battery design, even though the rest of the new vacuum was the same as the old one)

CmdrShepard,

Cordless power tools are absolutely worth it, if you use them even infrequently, and every single contactor I know uses them. The battery packs are ridiculously priced but they wouldn’t be used so ubiquitously (especially by professionals) if they weren’t worth the drawbacks. Having to string out extension cords for every tool would be a nightmare.

Lowbird,

I dunno, if you use them infrequently, having to string out a cord shouldn’t be any more of a hassle than for a vacuum, no?

And if you’re buying a cheap, probably-won’t-use-this much tool, I think you can get better power out of a corded tool for the price, which seems like a god tradeoff to me.

Burp,
Burp avatar

It’s be way harder for me to go back to corded tools. Li-Po tools are incredibly convenient. I’ve been able to buy adapters for dewalt batteries that make them work with all kinds of tools and devices (including an adapter for a Dyson handheld vacuum).
Lightweight, powerful, and the batteries can be swapped (as well as a decent amount of aftermarket batteries and adapters).

guyrocket,
guyrocket avatar

I have a few, select cordless tools. Drill is the first that comes to mind. I also have a corded drill because it was cheap to buy and has much more torque than the cordless.

Hmmm. Drill might be the only one. Most of my use is around the house so not a lot of need for cordless.

LollerCorleone,
LollerCorleone avatar

I still use them for my TV and AC remotes, flashlights and wall clocks.

I never realised that many people don't need to use it anymore.

UnhappyCamper,
UnhappyCamper avatar

Yeah, to me this seems like such a strange post. I can easily pick up batteries at most stores I go to and use them in various stuff in my home. Never thought about them phasing out right now, but when I think about it I guess it's true, I see a lot of gadgets that just charge with USB plugs now.

UndefinedIsNotAFunction,

My wife gave me a bunch with a charger for Christmas like 2 years back. They’re all still in rotation for controllers around the house!

scrubbles,
@scrubbles@poptalk.scrubbles.tech avatar

People don’t use them? Rechargeables are so easy and alkaline are so expensive! Rechargeables are about the same price now as alkaline but you get to continually recharge them forever! Why aren’t people doing that???

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

I feel like in many places they’re getting replaced with a built in battery and a USB port

jmcs,

The alkaline batteries have higher energy density, so they can be significantly less annoying on devices that use more power, like flashlights. I don’t understand why anyone would use them for things like remotes or wireless keyboards since the batteries will last a long time either way on low power devices.

scrubbles,
@scrubbles@poptalk.scrubbles.tech avatar

I use rechargeables for basic things, keyboards, mice, remotes, and I swap them out maybe every couple of months. I wouldn’t call that annoying. For critical things though I do use alkaline, and that’s for emergencies. Flashlight has a set of rechargeable D’s ready to go but I also keep alkaline ones right next to it in case the power is out for longer. Smoke/CO detectors use alkaline because they can go for so long before needing to be replaced

lloram239,

why anyone would use them for things like remotes or wireless keyboards

Alkalines leak a lot and they seem to be worse these days than they used to. From personal experience, there is about 1:10 chance you’ll be scrubbing battery contacts after using Alkaline. And if you forget to remove the battery when the device goes into storage, there is about a 100% chance it will be a crusty mess once you look at the device again, it can take years, but it’s pretty much unavoidable.

NiMH don’t leak, or at least much less frequently with much less catastrophic results. Also with modern low-self-discharge ones (Eneloop, Ikea LADDA) they last years, so they are very usable in TV remotes and the like.

There are a couple of rare devices that really want 1.5V to function properly (e.g. WMR Controller), in those cases 1.5V LiPo batteries can make a good rechargable alternative, but they are substantially more expensive than plain NiMH.

rikonium,

I remember shopping for a Bluetooth speaker and while I settled on a JBL one, I did consider the IKEA model that takes AAA’s but it wasn’t available to try nor buy - it would’ve been nice to be able to consider one that was externally powered but ah well.

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

Yeah, the first USB power bank we had at home also used 4 replaceable AAs. I wish this was still common

abhibeckert, (edited )

Those batteries in your photo are NiMH batteries… which discharge on their own at a fairly rapid rate even if you’re not using them at all. They’re also pretty big and heavy for the amount of power they provide (which, due to the self-discharge issue, is effectively a lot lower than the official number on the battery).

I strongly recommend investing in devices that use 18650 batteries. They’re about the same size/weight as a AA, and they last much longer (both in terms of from full to flat and also the number of years (decades?) of use you’ll get from the battery.

A lot of “proprietary” batteries are in fact a bunch of 18650 cells wired together.

It’s worth investing in good ones - the quality varies significantly from brand to the next. With a good 18650 cell, you won’t be replacing it when the battery expires, you’ll be transferring it to a new gadget when the gadget is broken or so old that you decided to buy a new/better model.

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

Oh I see, I’ll look into them. Yeah these are at least 10yrs old so I wouldn’t be surprised if the technology was quite bad for today’s standards

Stopkilling0,
Stopkilling0 avatar

An 18650 is way bigger than a AA

Rai,

But got damn does it ever put out some insane light! My flashlights turn night into day.

Nawor3565,

While all this is true, unfortunately not many devices support swappable 18650s, either they have swappable AA/AAA or have built-in 18650s that would require disassembly to replace. However, if you CAN find a device with swappable 18650s (the only ones I’ve found so far are flashlights) they’re absolutely great!

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

Wait, do they not make AA-sized 18650 batteries?

sparky1337,

18650 isn’t a specific type of battery, but a size. 18mm diameter, 65mm length, and 0 typically represents it being cylindrical in shape. 18+65+0

Heres a quick read

anlumo,

Besides being the wrong size by definition, AA batteries are expected to have 0.8V to 1.5V, while Lithium Ion cells (such as 18650) have a voltage range of 2V to 4.2V. That’s completely incompatible, you couldn’t even replace two AA batteries with a single Li-Ion cell.

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

Couldn’t it theoretically be fixed with a voltage regulator?

Vex_Detrause,

Don’t they need a circuit protection to not over-discharge lithium batteries? Most AA devices would suck all the juice from the battery until it stops working.

CmdrShepard,

Yes.

The other problem with lithium batteries like 18650s is that they need to be handled with care so manufacturers don’t want users swapping them in and out like AA/AAA. This is why they build them into devices and have you charge them through a regulated port.

lloram239,

Also there are numerous different versions and sizes of 18650, some come with protection circuit, some don’t, some have flat top, some have button top, and whatever type you end up with might or might not fit your device. Makes the whole situation quite confusing for the average user.

Revan343,

Well there aren’t really different sizes of 18650s, if you chance the size it’s no longer an 18650.

The flat vs button top issue can be annoying though

lloram239,

18650 with protection circuit are around 69mm in length instead of 65mm.

anlumo,

The problem with those is that the device loses the ability to sense the charge status of the battery, since the voltage remains the same until it’s empty.

abhibeckert,

NiMH AA’s have the same problem.

lloram239, (edited )

you couldn’t even replace two AA batteries with a single Li-Ion cell.

That can actually work. A single 14500 Li-Ion along with a dummy battery can work in many devices, as they have regulators for the voltage in the device (it might blow up other devices and won’t give any energy advantages). That said, there is very rarely any use for this these days, as you can buy 1.5V AA Li-Ion batteries with the voltage regulator build in, that will work in all devices. More expensive than NiMH however, so only really good when the device absolutely needs the 1.5V and isn’t happy with the 1.2V of NiMH.

abhibeckert,

Most 18650’s don’t go down to 2 volts. They should be considered “flat” at 3.4 volts - going any lower risks damaging the battery (unless you know what chemistry it uses, some can go lower safely).

Allowing a rechargeable AA to get down to 0.8V is also risky, if you go much lower than that you will damage the battery.

An 18650 is essentially the same voltage as three AA’s. And the amount of charge level they store is closer to five or six. The size and weight, on the other hand, is a bit more than one AA.

But the biggest advantage, by far, is a lot of devices can be powered by a single 18650 but would require multiple AA’s to have acceptable battery life (or a high enough voltage). As soon as you have multiple batteries thing start to get really complex. Your batteries will never be at exactly the same charge state and that can potentially damage the battery and the device.

lloram239,

They do, they are called “14500” (the name is the dimensions of the battery). Though it is important to remember that, despite looking exactly the same as a regular AA, they are 3.7V, so they’ll kill your regular 1.5V electronics if you put them in there. Not sure what they are actually used in, flashlights I assume, but they seem quite rare overall.

Only place I have seen them commonly used is solar powered garden lights, though in that case they are LiFePO4 3.2V, not Li-Ion 3.7V.

abhibeckert,

But 18650 size is manufactured at much higher scales than other sizes, and therefore it’s the cheapest, and therefore it continues to dominate.

Bobbinapples,

I am not aware of many devices that use swappable 18650's either. Off the top of my head the only ones i'm aware of are vape devices.

Damage,

My OWON portable oscilloscope does. The only device I know of.

B0rax,

There are also flashlights with 18650s. There are some powerbanks with exchangeable 18650s as well.

But that’s all I know of.

sparkl_motion,

I have a set of lasers powered by them as well. Love that it makes the whole thing a bit larger and durable.

ChaoticNeutralCzech,

These powerbanks can set your house on fire if the chip shorts out: the wire gets very hot and melts through the plastic like this: Odysee/YT/Piped. I recommend installing a 2A (for 1A powerbanks) or 5A (for 2.1A powerbanks) automobile fuse in series with the cells or each cell individually.

abhibeckert,

The main barrier is when you need multiple batteries.

If you install a dozen 18650’s in a device (or thousands in a car), they will work great as long as they’re all at the same charge level and can maintain the same voltage throughout the discharge cycle. If they can’t do that, then the battery could catch fire. Yikes. So any device with multiple 18650 cells will hard wire them together so the user is forced to use and charge and discard the entire set of cells as a single battery.

AA/AAA NiMH batteries won’t catch fire if they’re uneven, but being uneven will damage the batteries. You don’t need to keep them together to be safe, but you do need to keep them together if you want the batteries to last longer than six months. Keeping them together can be a logistical nightmare and it’s the main reason I’ve stopped using them… it’s just too much work to keep all the batteries together (especially if the device is shared in a household or workplace). If you get it wrong, then they don’t last much longer than disposables.

Disposable batteries have the same issue - but since they’re disposable you’re probably pulling four brand new batteries from a packet.

An 19650 cell holds about the same amount of energy as five AA batteries. So there are a lot of devices that can run well off a single battery, and those tend to be the ones that are user replaceable.

GoldenSpamfish,

They make USB rechargeable lithium ion batteries in every common form factor. I use lithium rechargeable AAA batteries in my mouse and they work great. You don’t even need a charger, they are USB-C. Highly recommend.

lloram239, (edited )

They can be very useful for the devices that want the full 1.5V, as they can provide that 1.5V across their whole charge cycle, unlike NiMH and Alkalines that drop down the voltage. They are also lighter than NiMH. However they are also more expensive and for most devices NiMH will work just as well, while costing less.

Another thing worth mentioning, NiMH show charge in mAh on the package, Li-Ion very often give it at mWh, which makes the Li-Ion look 20% bigger than they are.

admiralteal,

It infuriates me that we use Wh/Ah instead of Joules for this.

It's like measuring distances with time -- "NYC is 3.4 highway hours from DC" -- except doing it in a world where no one has any idea what speed people drive on the highway.

GoldenSpamfish,

I mean I can’t really blame them for being smaller, the USB port is a lot of value added but is also pretty huge.

cmnybo,

Low self discharge NiMH batteries have been available for a long time now. They hold a charge for several years.

Powderhorn,
@Powderhorn@beehaw.org avatar

I had some Molicel (I want to say, P26s) 18650s in regular rotation that lasted only three years. I went through Mooch’s battery reviews ahead of selecting them, purchsed them at Liionwholesale, and they started heating up in my Nitecore one by one after maybe 1,200 full discharge (e-cig) cycles. Meanwhile, I have vape-shop NCRs from 2016 still humming along (though rarely used).

At this point, I’m not really sure what to make of battery reviews. And the economics work fine for three years of consistent use. I just wish that was how they were sold, not like some absurd number you’ll never hit.

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

Oh I see, I’ll look into them. Yeah these are at least 10yrs old so I wouldn’t be surprised if the technology was quite bad for today’s standards

admiralteal,

For example, basically all power tool batteries.

If they advertise ~12V, it usually means it is 3 'cells' of 18650s in series. Crack open the case on such a tool battery and you'll find just that -- 3 18650 batteries for a little one. A high capacity battery might instead of 6, with 3 pairs of 2 parallel batteries, doubling the capacity. And nothing but weight and size stops them from just making them ever-larger.

18-20v tools are 6 cells (18v is the nominal voltage, 20v is the 'max' voltage at full charge). For higher cap, add more batteries in parallel in each series cell.

It is RARE to be able to service these unless you have some specialized skills. Typically, they are spot welded together, which can be dangerous to attempt to DIY. That said, often when a battery 'fails', it's actually just one 18650 that has failed and taken the others down with it.

These days you do see other sizes. 21700s or even pouch batteries are starting to be more common when tools need more stored joules per unit volume.

Voyajer,
Voyajer avatar

20V tools are 5S rather than 6S

GreatAlbatross,
@GreatAlbatross@feddit.uk avatar

There are some clever innovations from some tool manufacturers too.
DeWalt has launched batteries that work with both 18v and 54v systems, by having different pins on the output wired to different points in the battery chain.

(3 sets of 3 in series for 18v, or 9 in parallel for 54v, I’m assuming)

abhibeckert,

18-20v tools are 6 cells

That’s not my experience - my preferred brand* offers 18V batteries at 3Ah, 6Ah and 9Ah. They also have higher end tools that take 56V batteries - either 4Ah or 8Ah.

I haven’t opened them up to check, but surely the higher capacity batteries have more cells.

(* preferred brand because it’s the one I already have a bunch of batteries for… I actually regret choosing that brand)

That said, often when a battery ‘fails’, it’s actually just one 18650 that has failed and taken the others down with it.

Sure… but if you replace that one “bad” cell before it takes down the others, the battery might spontaneously combust and burn down your house while you’re (hopefully?) not home. 18650’s in series have to be the same voltage throughout the charge cycle.

admiralteal,

The charger for the tool batteries has to have circuits to get all individual cells to the same voltage. They are not simply charging them all at once in series. More complex than that, but there is a second circuit for an alternate config that the charger can make use of to charge.

If one cell is dying/dead, it stops the whole battery from working. Replacing that individual cell would allow the others that are still performing nominally to continue to do so. If it were practical to change one cell. Which it really isn't. But old tool batteries can be a good place to cannibalize 18650s from if you need them for other uses because a "dead" battery likely still has at least some OK 18650s in it.

The 56-60V tools just has triples of all the batteries with an additional circuit path to let them either function in the 18V 5s or 56v 15s configuration, depending on what it is plugged into. Similar story with the brands advertising 40V tools. There's a reason they're all staying on multiples of the 18-20V base.

I literally said there can be more 18650s for each series cell. The "not your experience" you referenced is... exactly the same thing I said. Though it is actually 5 18650s for a base battery, not 6, I misremembered that. 3.7V x 5 cells = 18.5V (which some brands advertise as a max 20V to make the number bigger while others just call it 18V). Each cell is 2.4 Ah, which gets you the base battery capacity. The even-smaller cells are either using pouch batteries or something else that isn't an 18650.

Voyajer,
Voyajer avatar

18650s are in no way close to the same size as AA batteries. Your other points ring true and I generally agree with them though.

thingsiplay,
thingsiplay avatar

@abhibeckert I have those from Eneloop. They do not discharge that fast as the old generation of rechargeable batteries. Yes they do, but the rate is quiet slow.

I_Miss_Daniel,
I_Miss_Daniel avatar

I second that. Have been migrating devices over to eneloop batteries successfully. (other NiMH batteries go flat after a month even if not used.)

Burp,
Burp avatar

Same. People used low quality Ni-Mh batteries and got what they paid for. Eneloops have worked great for me. Believe it or not, Duracell has been great too. It’s the energizers that have all been awful for me.

TopHat,

Since I got those from Ikea, I just want devices to go back to those types of batteries instead of internal battery packs. Still got to appreciate the Xbox controllers sticking to that principle (for now).

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

Exactly. The trend of switching to built in batteries + USB is dumb.

TopHat,

Don’t get me wrong - I think an included battery that’s rechargeable through USB is fantastic. Less customer inconvenience. But they should either go with a standard that’s easily reproducible or go with regular rechargeable batteries.

avidamoeba,
@avidamoeba@lemmy.ca avatar

Li-Ion solved this problem.

TopHat,

If it was so easy to replace them, with each Li-Ion battery being different for every type of device.

MisterD,

I wish power tool companies would get off the proprietary batteries and adopt the CAS standard www.cordless-alliance-system.com

MonkderZweite,

That’ why i actively look for battery instead of akku in some wireless devices. They are the closest to universal akku size we’ve got. Now they only need to be flater. And charging over USB-C would be nice too.

dan,
@dan@upvote.au avatar

Does “akku” mean a built-in battery? Google tells me it’s German or Finnish?

MonkderZweite,

Whoops. Yes, Akkumulator = rechargable, Batterie = one-use

gigachad,

It is a German word (short for Akkumulator), but we call batteries that you can replace Akku too.

MonkderZweite,

We here don’t, but maybe thats different in other german speaking parts.

gigachad,

Yes, I was speaking for Germany. No idea what an Eidgenosse would say

monotrox,

The single battery cells in electric cars are pretty much already standardized in size, just the assemblies and cooling systems are not.

shagie,

(Linking for the pictures - not the site)

…alibaba.com/…/14_4v_new_auto_cell_ni_mh_6500mah_…

If you look at the battery pack, you’ll see that its a large number of C cells bound together into rods and then into a “brick” of a battery that then looks like:

sciencephoto.com/…/honda-insight-battery-pack

You’ll see a similar setup for a Prius (note this is updated from the older ‘prismatic’ modules): electronhybridsolution.com/…/toyota-prius-v-2012-…

Liz,

That’s true for kinda sorta everything? Battery manufacturers don’t want to have to deal with creating a bunch of custom battery runs, so they end up standardizing and higher level manufacturers buy from there. This is especially true in situations where space isn’t at an absolute premium (like it is in a phone). Open up the battery pack for your cordless drill and you’ll find very standard batteries inside there, probably hooked up in series to get to the desired voltage.

jeanofthedead,
jeanofthedead avatar

I wouldn't say they're out of fashion - a lot of smart home devices are moving away from disposable cell batteries and over to rechargeable batteries.

SubArcticTundra,
@SubArcticTundra@lemmy.ml avatar

That’s good to hear, I had a feeling it was all moving in the direction of glued in battery + usb

oldfart,

To built-in lipo batteries that go bad after a few years and you have to trash your device or tinker?

jeanofthedead,
jeanofthedead avatar

No - rechargeable AA/AAA batteries.

dan,
@dan@upvote.au avatar

Do you mean built-in rechargeable batteries? Because that’s way worse than removable batteries.

Zigbee smart home devices last a very long time on cell batteries (CR2050 or something similar) that I’m not really worried about those. I’ve got door sensors that have been going for over 2 years on the same batteries.

jeanofthedead,
jeanofthedead avatar

No - look at the IKEA smartphone line (TRÅDFRI and the like). They have stopped producing Zigbee devices that require CR2032 batteries and have released larger units that take AAA/AA rechargeable batteries.

account_93,

My mouse uses batteries too, Just swap out once it dies on me.

MonkderZweite,

All month, because rapoo energy management sucks.

user224,

My wireless mouse is running on the same 2 AAAs for over a year already. I have no idea how. They still show 1.2V. I expected like a week or two.

monotrox,

The logitech g305 runs on a single rechargable AA for half a year and is probably the only reason I even considered a wireless mouse

dan,
@dan@upvote.au avatar

I use a Logitech Marathon M705 mouse that lasts 3 years on two AA batteries, according to Logitech. I’ve got Eneloops in it that I’ve been using for around 10 years now, and I’ve had to charge them maybe 4 times in total?

I’ve got an older model. They cheaped out on newer revisions, making the plastic thinner and replacing the metal scroll wheel with a plastic one.

AI_toothbrush,

Just saying modern devices could also have interchangable batteries. There are standard lipo pouch sizes and standard lithium cilinder sizes.

happyhippo,

Invest in a solid charger (30-40€ will do). You’ll keep it for years, it’ll charge an odd number of batteries as well (unlike some cheap ones that only charge in pairs) and it charges just the right amount, then stops. Some even have battery test/discharge function, and charge more than just AA/AAA.

Then invest in a bunch of rechargeables, possibly Eneloops or something good from Amazon.

Now profit for years to come. The planet will thank you as well.

Honestly single use consumer batteries should be banned.

user224,

The Liitokala charges seem nice. I’ve got Lii-PD4 for €13 on AliExpress. Unfortunately I didn’t have any extra money to spare for one with discharge capacity testing, otherwise I’d get the Lii-500.

https://lemmy.sdf.org/pictrs/image/67f5ea53-44d1-4854-b2ac-c681e7fceba7.png

Just be careful not to accidentally press a button on it right after inserting the battery, while the percentage is still blinking, otherwise you may happen to accidentally override the charging voltage and e.g. give the battery 4.35V instead of 4.2V. boom.

kent_eh,

The 18650 should have become the ubiquitous replacement in most applications, but nooo, the manufacturers had to go all proprietary and enforce even more planned obsolescence

stevedidwhat_infosec,

18650s can be pretty explosive if not properly handled though compared to traditional Lithium based rechargeables though, no?

oldfart,

If they’re safe enough for teenagers with ecigs, they’re safe enough for general use I’d say

stevedidwhat_infosec,

Adult devices != children’s toys for obvious reasons

nyan, (edited )

There’s more than one lilthium battery chemistry. LiFePO4 is pretty safe even when mistreated. Lithium-cobalt chemistries are the ones that tend to catch on fire, make their pouches inflate like balloons, and so on. I’ve seen 18650s labelled specifically as LiFePO4, so safe ones do exist.

stevedidwhat_infosec,

Sweet, I wasn’t sure of the polymer carpets or the lithium nickel ones were more or less explody and murdery

nyan,

Well, the rechargeable batteries that are least likely to blow up in your face are the ones with the old-style NiMH (nickel metal hydride) chemistry that they use in rechargeable AAs and such. They have lower energy density than the lithium chemistries, so there’s less there to explode. They’re pretty inert unless you stuff them into a charger that doesn’t work properly—a busted charger can set just about any battery on fire. (Why is the NiMH chemistry still used for AAs? Because the normal voltage of a single NiMH cell falls nicely in the middle of the voltage discharge curve of a single alkaline cell. Lithium chemistries don’t have that property.)

jaschen,

The downside is the volt is not 1.5volts. Its closer to 1.2volts. This is fine if you’re using 2 batteries for things like the TV remote. But when you’re using things that require more than 4 batteries, then you might get into some weirdness. I have a remote for my DSLR that sends infrared to the softbox. Every 10 shots, it would miss the shot. It turned out to be the batteries. It needed all 6Volts vs 4.8Volts.

wim,

These days there’s also Lithium ion AA batteries, with different voltages. You can get them downvolted to anything from 1.5 to 1.8V.

The ones over 1.5V are commonly used in applications with electronic motors, since it allows you to effectively overdrive the toy or whatever it is you’re powering.

stevedidwhat_infosec,

Life hax right here

Fidelity9373,

Every battery has a voltage curve though; even alkaline batteries will drop off the 1.5v region after some time. Comparatively, ni-mh rechargeables will hold 1.2v more consistently and for longer than an alkaline, where it's voltage drops pretty quickly as the battery dies.

stevedidwhat_infosec,

This

RickRussell_CA,

Nickel Zinc rechargeable, peak 1.8V with 1.6V nominal.

Or newish LiIon cells that operate right at 1.5V.

nikt,

Alkaline batteries lose voltage as they drain, so 1.5V is at full charge but it drops down to about 1.2V very quickly and then stays at 1.0V - 1.2V for most of the alkaline battery’s operating life.

NiMH batteries tend to consistently stay at their nominal voltage (1.2V) through their entire charge.

So in other words, if you have devices that really expect exactly 1.5V per battery, they would only work with alkalines at the very top of their charge. Nowadays most non-garbage circuits should be designed to work just fine with anything above 1V per battery.

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