From the moment I asked I kept thinking "please don't be the US. Please don't be the US."

I'm not surprised though.

I hope whatever job you have now is much better than that hell.

not just for phones but also for human being

I am more concerned about wasting charge cycles. Thanks for reminding me how we consumers are nothing more than replaceable batteries…

U.S... The wall street thing tends to be fairly nuts in junior positions.

I'm almost afraid to ask, but what country did that take place in if you don't mind me asking.

It's not something that all lithium ion batteries have, and if you used them in something other than phones you'd be painfully aware of how fun it is to install your own PCM which I've done for my motorcycle and several RC cars and Airsoft guns. Replacing batteries often is expensive.

I never said the PCM added lifespan, but what it does do is dispel this myth that it's catastrophically damaging to your phone battery to discharge it to 0%. It's not. Your phone turns off at 10% capacity at the very least (no matter what the indicator on the phone says), otherwise phone fires would be an insanely common occurrence. I don't know a single person who hasn't had their phone die at least once with obviously no issues.

Actually getting a lithium ion battery to 0v is very bad cuz it's dead, but unless you're working with the battery completely stripped of all protections and software it will never reach this point.

Jump into the abyss of your fears so you may drown in your dark vomit of illusions.

All lithium batteries use protection for undervoltage (aka low voltage protection), either built into cell / pack or built into the device. PCM/BMS is standard, not some special thing that phones have.

You just read that 'technically empty doesn't mean there is no energy left' , because its physically possible to drain a cell down to 0v while protection stops at 2.7v or whatever. Thats not made to add more lifespan than normal, thats to prevent the battery from exploding after you discharge it below 2.5v and then try to charge it. Any cell that has gone under 2.5v should be considered destroyed and not used. It may be possible to revive the cell by charging it up slowly while monitoring heat but is almost never worth it since even if doesn't catch fire it is permanently damaged and will have poor performance. The 'do not do low discharge' advice is for the last part inside the allowed range

& where's the motivation?

When I was a junior analyst at a finance firm a group told our boss that the 100+ hour weeks were too much to physically handle our boss called a doctor into the office to write everyone Adderall prescriptions.

(Table 2 in my link shows that discharging an NMC battery, the ones used in phones by 100% did in fact cause it to go to 70% capacity by 300 cycles) That 500 cycles to 80% ignores every other kind of battery depleting issue, like the fact that TIME also degrades your battery among several others.. But yeah, all cellphone cells have a PCM that blocks them from going below the minimum voltage by quite a bit.

i'm motivated, to be permanently on break since i'm never in the green and always yellow or red

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This post would work well in r/thinkatives

This would work well in r/thinkatives

Both are in prison tho

This is also incorrect. All modern phone batteries have a PCM (Actually they use a BMS, a more robust sysem than PCM. I use PCM's in other equipment myself so I was biased to this type of battery protection) so they CANNOT be fully discharged no matter how hard you try. You can bring your phone battery to 1% or dead and the phone actually still has plenty of juice left, the PCM just keeps that charge so the phone cant brick the battery. The best practice is to keep your phone battery between 15-60%, you'll get close to 900% charging efficiency vs. charging to 100% (which is 100% efficiency) or charging to 85% (200% efficient) at least according to the battery tracking software accubattery I've been using for the past year.

Do you have some sort of actual source for this? Becuase what " stop battery draw well before the battery actually loses all charge " usually means is that the low voltage protection is set to a high voltage such as 2.7v or 3v instead of the actual minimum voltage of 2.5v. That doesnt protect you nearly as much as it sounds like because the voltage curve is not linear, it flattens out at 3.7v for a while, so 3.3v is already down to 15% left or so

edit: also typical lithium ion lifespan is 500 cycles to 80%