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Windows has a "PC Health App" which should report this number if it is supported by your device.
Lithium Ion batteries always report 100% charge, when they reach their peak current capacity, this is not necessarily the capacity they had at purchase.
My Surface Pro 4 was down to about 80% battery health from lite usage or about 7 hours, after about six years. Now approaching ten years later it is currently reporting that it is now down to 61% Battery Health, or about 2-3 hours.
It still charges to "100%" like all devices do these days, but 100% is now down to 3 hours, vs 8-9 hours at purchase. I think Windows 10 was lighter on the device at launch, the device seems slower these days overall, draining additional batter life...
I did some googling though and found a review of my old XPS laptop from 2014 and dell originally spec'd it at 11 hours battery life, the reviewer saw 9.5 - 10 hours typically and I'm getting about 7.5 - 8 hours on battery the last time I used it off-power a few weeks ago. So probably battery life is around 80%'ish, roughly, maybe 85%. Charging it to 100% on battery and making sure it stays plugged in to AC power after 100% doesn't seem to of effected much of anything. Maybe it degraded the battery -10% from new after 10 years but that's trivial really.
Even on Laptops that were from around 2009 onward I could check the Battery Health with CPUID HWMonitor. Most support this type of a feature its just that the OS' didn't have a readily available feature and most of the OEM software suites were way behind the times as far as features. Now it's been pretty standard ever since UEFI become the norm in Laptops.
NO ONE is keeping a laptop or computer for active daily usage longer than 10 years. That's not something to even discuss. That's way way way outside of the typical usable lifespan of a mobile device.
And with most Laptop brands, while they might cover the whole laptop for 1-4 years depending on your coverage plan, they still will only cover the battery for 1 year.
Going by your other statements, you do not actually leave it plugged in constantly, as if it was a Desktop device without a battery. A "Home Console", like some may use the Nintendo Switch.
There are literally millions of people who are using systems that are 10+ years old, who are you trying to fool? I still have an i5-3470.
But again folks need to understand how the hardware works a bit too.
Keep in mind that devices such as Phone, Tablet, Handhelds (such as ones from Nintendo, ASUS, MSI, Valve) are designed in a manner in which the battery is the primary power source. The external power is secondary and must run through the battery to reach the device. Laptops are NOT that way and are driven by the wall power adapter first, battery second. Much like would be the case if you were using a Desktop connected via UPS battery backup, where the wall power comes first.
The issue is that leaving it at 100%, ALL of the time, regardless of whether or not it is being actively charged, is bad for the health of the Lithium Ion battery.
Either holding it at a 50% charge while plugged in, or using it routinely enough so that the time spent at 100% is minuscule, extends the life of the battery.
When using the battery as it was intended to be used, you mainly have to worry about not letting it drop below 30%, which is where Lithium Ion batteries typically lose most of their capacity.
No. It's not luck at all. My experience is perfectly normal and to be expected. I have a newer Dell XPS 13 laptop (2019 edition) that I actively use for daily work. I also always charge that one to 100% (and leave it plugged into the wall for 1-2 days after 100%) and it hasn't shown any degradation at all yet in the 5 years I've owned it.
I'm with that shaggin person: You're making up random crap just to argue for nothing. We can all see you're baiting people into arguments. The things you write don't even actually make sense to anyone but you.
LOLOL nice one. No they don't. Not for their main computer they use daily. That's completely effing laughable. I had a nice laugh at that comment. I'm sure you don't daily-drive your 3470. That's a terribly slow potato computer to even try to use for anything modern today. Nice try there bud. But I can see right through your lies and BS.
90% of its life is spent plugged in, when you, supposedly,still have 90% Battery Health, that seems absolutely absurd. Sell the laptop and gust get a mini PC. Your uptime can't be that critical, and if it is I would imagine replacing a surge protector would be more trivial that an internal battery.
I'm not going to spend money to buy something I don't need. The old XPS laptop is perfectly fine for what I use it for, I already own it. Sometimes I have cars to do work on and need to take it under the lift to look at something while working underneath cars, so I still need a working battery in it. It has nothing to do with uptime.
I've always charged this thing to 100% intentionally. It would never go back on battery until it charged up to 100% again, exactly like I do all of my portable / mobile devices. Anything with a battery always gets a full charge to 100% before it's used again. I've never had any problems with battery life on any device.
I'm not making things up, I linked multiple sources involving qualified experts, and both of you literally came into this thread swinging at people who have a different opinion from you, and doing nothing but fighting with us when neither of you even fully understand the technology yourselves. Neither of you are qualified to make any determinations that people should just ignore the advice of experts that are only trying to help people make the most out of the batteries in their devices.
You're wrong, many people still do use 10+ year old hardware because they can't afford to get better systems, that was literally part of the argument against Windows 7 being axed from Steam because the people here that were and still are using 7 are using older machines mainly and don't like the newer versions of Windows.
Millions of people are still using older systems daily because they work, not everyone is going to upgrade their crap every few years when they don't need to, you definitely don't need a brand new 6+ core CPU just to watch videos, do word processing, light gaming, etc.
You're right, I don't daily drive my i5-3470, but I still use it daily as an HTPC and I have tested it in games with an RTX 2080 and it was doing well in spite of it "being a potato."
A lot of people use old hardware configurations for whatever they need a machine for, you can't honestly sit there and believe that absolutely nobody is still daily driving that level of hardware... I guess that's an American philosophy, because Sandy Bridge and Ivy Bridge era hardware is still very prevalent in Russia, China, etc. and they even do hackjobs those old boards so they can run server CPUs on standard desktop chipsets with custom BIOS. I think you need to check your privilege.
There's no reason for you to even be here fighting about this, you weren't even interested until you saw a battle to fight.