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Okay, so what im talking about is that out of the 3500mAh your battery have, you can only use 1400mAh out of it. You're asking why?
I decided to charge my phone battery from 0% to 100%. I discharged it completely, and left my phone turned off into the charger. I used my fast charge brick, which is capable of 9V and 1.67A, which is 15W. One thing i can say for sure is that your phone never charges with 15 watts, it starts around 11W, and after 50%-60% it goes down to 7W.
So yeah, i did 0% to 100%. It took me 1 hour and 38 minutes. Exactly the time you can see on charge tests in youtube.
I have to note that i used a usb tester while charging my phone, and my usb tester measured 1345mAh charged, as you can see in this picture:
(It says 4.92V because my phone was no longer connected to the charger. When yo disconnect the device from the power brick, volts drop from 9V to 5V)
1345mAh out of 3500mAh is about 38.44%
My phone is almost a year old, and samsung claims up to 5% battery degradation in 2 years. I consider myself a heavy user, so 2% seems exactly what samsung claims, so my battery degraded around 2%.
1400mAh out of 3500mAh is exactly 40%. So for this year i have lost around 55mAh out of my battery capacity.
3500mAh - 1400mAh = 2100mAh.
2100mAh is 60% of the battery capacity.
What im trying to say is that Samsung (and probably most of the flagships right now) cap their batteries, so they can degrade slower. If you can use only 40% of your battery capacity, that means that your battery wont discharge less than 30%, and wont let it overcharge more than 70% (thats exactly the 60% missing)
So when your 3500mAh S9+ battery is at 0%, it got 1050mAh left in it, and when its fully charged at 100%, it keeps 2450mAh in it.
My old chinese phone had 4100mAh battery, and it charged 3800mAh from 0% to 100%. My battery died in 1 year, but i've got a long battery life through that time. Dont get me wrong, i know that modern phones have overcharge, and overdischarge protection, but i've had no idea it was as high as 30%. I can get ~6 hours of SoT working on my phone, if i could use all of those 3500mAh, i could get around 15hrs of SoT, which really is a lot.
I was just curious, nobody is going to read all of this anyway, lol. But thank you, whoever actually did read the whole thing.
