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.
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.
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???
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.
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
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
18650s can be pretty explosive if not properly handled though compared to traditional Lithium based rechargeables though, no?
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.
Sweet, I wasn’t sure of the polymer carpets or the lithium nickel ones were more or less explody and murdery
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.)
If they’re safe enough for teenagers with ecigs, they’re safe enough for general use I’d say
I wish power tool companies would get off the proprietary batteries and adopt the CAS standard https://www.cordless-alliance-system.com/
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.
Tipp for people wanting to get into rechargeable AA and AAAs: get IKEA Ladda batteries and their charger. They are cheap and japanese made. Some people argue that they are just relabeled Panasonic eneloops!
Edit: Oh also if you used rechargeable batteries in the past and you remember them sucking that’s probably true. But the battery chemistry is better now and it’s possible that your batteries degraded quickly because of “dumb” chargers. Modern chargers like the gray 4 battery Ikea charger detect how and for how long to charge and thus will not ruin the batteries.
Its unlikely Panasonic eneloops. Project Farm does a great test for all the batteries and the IKEA showed no characteristics to the Panasonics. https://youtu.be/0A1GvQ40j0Q
The two cells tested in that video are different. The Ladda 2450 mAh is equivalent to the black wrapped Eneloop Pro, but the video only tests the standard white Eneloops which have less capacity but a better cycle life rating. This is honestly one of the most disappointing videos I’ve seen from Project Farm, he didn’t test most of what makes a cell better/worse.
Whether or not they are identical cells, from what I’ve read there is only one factory in Japan that makes NiMH cells, so the Eneloops and the Ladda come from the same factory and are therefore likely to be very similar.
Ahhh, I didn’t know that about the Eneloops Pro. Thanks.
Thanks for the info! It’s incredible how much the quality of batteries and chargers vary. It’s good to know a cheap easy place to get them
LADDA are my go-to as well. I recommended going with the wall charges and not the USB-A charger, since the latter juices them up very slowly (compared to the wall outlet or the storage+charge box).
The single battery cells in electric cars are pretty much already standardized in size, just the assemblies and cooling systems are not.
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.
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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.
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.
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.
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.
The best part is that these batteries don’t leak and destroy your devices like alkaline batteries.
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.
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!
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.
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.
There are also flashlights with 18650s. There are some powerbanks with exchangeable 18650s as well.
But that’s all I know of.
I have a set of lasers powered by them as well. Love that it makes the whole thing a bit larger and durable.
My OWON portable oscilloscope does. The only device I know of.
Wait, do they not make AA-sized 18650 batteries?
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.
Couldn’t it theoretically be fixed with a voltage regulator?
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.
But 18650 size is manufactured at much higher scales than other sizes, and therefore it’s the cheapest, and therefore it continues to dominate.
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
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.
An 18650 is way bigger than a AA
But got damn does it ever put out some insane light! My flashlights turn night into day.
Low self discharge NiMH batteries have been available for a long time now. They hold a charge for several years.
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.
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.
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.
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).
Exactly. The trend of switching to built in batteries + USB is dumb.
Li-Ion solved this problem.
If it was so easy to replace them, with each Li-Ion battery being different for every type of device.
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.
Does “akku” mean a built-in battery? Google tells me it’s German or Finnish?
It is a German word (short for Akkumulator), but we call batteries that you can replace Akku too.
Just saying modern devices could also have interchangable batteries. There are standard lipo pouch sizes and standard lithium cilinder sizes.
@SubArcticTundra Also add XBox game controllers to the list. I have multiple pair of rechargeable batteries. It’s way better than having integrated batteries like in the PS controllers. I can just swap the set out for a full set, right away. Doing this since Xbox 360.
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.
