I was not speculating about primary battery failures. Go try it with any hand held, made in the last 5 years. Its not a "it will not function due to intent of manufacturer". It is a problem of poor design and crap components. Its not difficult to test what Im talking about. Anyone who owns these products can open the device and unplug the battery. Plug the device into a wall outlet power. Then run the device. It will probably turn on eventually. But then crash due to throttling and no power control (because crap components and design).

When a battery dies, it must be replaced. Never saw a laptop or whatever dying from removing the main battery, that only revert the BIOS/UEFI settings to default.
Maybe I'm lucky enough to never seen one that dies, my only experience with a weird behaviour regarding the cmos battery was a Toshiba laptop (old, first gen i5) that wouldn't boot at all without the cmos battery. Most devices, including some that don't have a cmos battery, once plugged they try to turn on, if the charger current is not enough the device turns off (usually in a matter of miliseconds to seconds). I must stress that this is only my limited experience.
Worth noting that sometimes the undercharge/voltage systems on the batteries will send a signal to impede device of turning on below a set state of charge/voltage, but this is a safety mechanism not planned obsolescence.

The thing is, even the Lithium cmos battery will deplete at some time, most CR2032 (non rechargeable) batteries used in desktops will not hold enough charge in less than one year after being unplugged. The usual laptops batteries are even smaller.
Even if the device has a dead main battery, assuming it cannot be replaced (I'm looking at you freaking Microsoft Surface line!), it will be a matter of time before the cmos battery depletes and render the device unusable (not in my experience but I trust you in that matter).
What I mean is that the CMOS battery don't solve the problem, only delay them. The possibility of replacing the main battery does.

If you're curious, I can try that with the Deck but even if it can supply more than enough power for the device to work, I'm pretty sure there aren't sufficient decoupling caps to deal with transients. It will most likelly crash.

What I'm not being able to understand (pardon my ignorance), is why such a device is inerently not good with such behaviour?
I mean, yes, those freaking Surface products that cannot be dissassembled to change the battery are indeed disposable. Most devices were talking about (handhelds) the main battery is removable.

Unfortunately, a 10 inch screen would mean that it wouldn't fit in my purse.

Those portable devices, mainly smartphones and handhelds... but even many laptops, are a "throwaway-product" with no higher lifetime-expectancy than 5 years. In many cases the first serious problems may show up at the age of 4 years or even sooner.

Not any different on my Xiaomi Smartphone. Technically it is still working alright after over 4 years has passed (which is already a miracle...) but the sceen is slowly becoming defective as there are now small artifacts at the edge and it will only increase. I think 5 years is all i could ever ask for... after that it is ultimately done. However, the battery had lesser issues than many of the new Iphones from some people i know, so it is not any worse but in order to last over 5 years without serious issues, someone either need to be very lucky or extremely careful while using it and never let it heat up to much... almost unrealistic in every-day use.

On a good quality PC it totally depends on the components. A good PSU can surpass way more than 10 years, even up to 20 years is possible but i worry the expensive MB which is full of sensitive chips and the processors in general. Nowadays the SOC is a rather brittle thing that simply got a limited lifetime due to its very small and cramped architecture with different Volt-parameters inside able to cause power discharge. So, SOC or other chips may die first, even at very good cooling... i assume. But it will surely stay up longer than the average mobile device... at least 7 years but with some luck and good cooling maybe even up to 10 years. In my mind, AMD should use another bigger node for the SOC because 5 nm or lesser is not anymore that sturdy compared to a bigger node. The electro migration and many other factors is still kicking in... and on a smaller node with way more destruction.

I am glad my 3090 TI is still on 8 nm and with a huge chip, that thing, along with the entire design, is a nowadays rare sturdy beast... and in theory able to surpass the lifetime of almost any other chips or electrical parts. Although it may get exchanged way sooner than its theoretical lifetime, it will still serve as a backup. I have no interest selling a rare sturdy hardware piece because the quality is more important to me than consumption or sheer performance.

In my mind the lowest "safe" node for silicon is about 7 nm, with the lowest chips it has been surpassed with questionable results on the expected lifetime and cooling possibilities (it is getting very hard at such a small die). There might be another material (graphen, MoS2) at some point able to go down to about 1 nm with not to much durability and cooling issues... however, this is probably the lowest possible so, we have to prepare this industry either for better architectures or a totally different approach like quantum-technology... but this is still very far into the future.

3-4 nm or lesser on silicon i consider dodgy... it surely will decrease the endurance, maybe to a level not anymore enjoyable for anyone not willing to throw a device away after around 5 years. So, no... going smaller is not always better, there are trade offs which may bite the users in the butt at some point.

I think the devices of the "current age" are made with the battery in mind, because the battery is acting like a "power-buffer" in order to filter out bad power. I already told countless times... shape is the key, not just power (or what else). Without a battery the power quality using a bad PSU is that worse... it can literally destroy all the internal components pretty quick. Even a "usual PC" can be vulnerable to it if we use a really bad PSU... but usually most PSUs on the PC market are built with sufficient quality. In general, many of the small portable PSUs are inferior quality because it simply is difficult putting in "good tech" inside such a small space and even trying to be cost effective. Much less of a issue on a PSU with a certain size... with lot of room for good filtering capacitors and what else.

Indeed, the internal components are not of the best quality with bad power controller and what else... because if so, a good controller would just shut down itself in term of bad power or any other failure, kinda the same way a GPU would be acting in such a case (using a bad PSU or becoming a internal failure).

However, the design has been made, as i told, to use the battery as a "buffer" in order to create a better power-quality. It could probably be circumvented by a very good PSU but most likely not with the one delivered in the package. Yes, they may save up on every cent, on a PSU too if they feel "it is sufficient paired with the battery".

Those old devices: At first they was way more sturdy than nowadays processors and many of the components, and at second they had another design which was not made in order to use the battery as a "power-buffer", and this will ONLY work with recharge able batterys. Still... the old Japanese tech, made around the millennium and sooner, simply got... generally... supreme quality which is not the case anymore in todays age. I got consoles still working fine after countless of decades... with the old "Japanese-tech"... but nowadays this time is over... 5 years is now almost the magical limit on many portable devices and around 10 years on PCs.

Even a modern car may not last much longer than 10 years because the electronics simply may say "goodbye" at some point. 20 years or more of the very old cars... i consider almost impossible. Sure, the "green party" is supporting it like crazy... fools that want to push a agenda of something they lack any knowledge from.

General rule: Do never ever let a mobile device run without a battery inside, because this is part of the "design".

This is a perfect commentary on the situation.

Except that the post you made had *nothing* to do with the topic. So, while the thread may be appropriate for voicing that opinion, that doesn't apply to any content that was actually in the post in question. Hence, that necro post was not an appropriate necro.

If you're going to necro a topic with the intent of voicing an opinion on the topic, your necro needs to actually voice said opinion.

Wanting a handheld device to be easily portable is not an unreasonable desire lol. Devices, like the GPD Win 4 and especially the GPD Win Mini are both significantly smaller and more portable than the Steam Deck, while having more powerful hardware and having better game compatibility. And both have physical keyboards too for that matter lol.

Look into the GPD Win Mini. It is a 7" clamshell. Very small for an actual fully-fledged laptop. I have it and it's great.

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I really hope you will get banned forever for this comment alone.

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If you have to be a racist transphobic troll to draw attention to Linux gaming on GOG, please, do the rest of us a favour and just don't.

Scenario: You lack a primary battery for any reason at all. No cmos battery, the operating system behaves buggy and the whole device will not stay active even plugged into a wall outlet. Usually due to poor power control.

Some turn on yes, but if you had anything important on the device. You are in trouble now, because these machines will be useless in practical purpose use.

Sounds as if you have actually testet that and you know with absolute certainty, that the devices need a battery to control input power.

Since USB-C and "intelligent" handshaking between adapter and chipset a lot has changed. The Slide I use (which has the same chipset as other new devices) does not use the battery at all while it's plugged in. It changes the transfer rate as needed.