So what's the actual correct way of keeping a smartphone battery healthy...

So what's the actual correct way of keeping a smartphone battery healthy? Some say "Just charge to 70-80% unless you absolutely have reason for 100%", others "lol dude just make sure to hit 100% everytime". Which is the "correct" way of doing it to ensure maximum battery life and health?

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Just charge it to 100% and dont over use the phone. Try not to use battery saving mode unless you need to. Generally speaking modern smartphone batteries can last quite a while if u take it easy on them.
I tried the charge till 70-80 thing and it didnt make a difference so i think its just a meme

batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

LiPo can be charged indefinitely because unlike older NiMh batteries it doesn't suffer from memory effect. You can charge it to 100%, just don't leave it on the charger all the time. However don't overstress the battery, don't let it go below 20% unless you have a good reason to. The threshold I set for myself is 30%, if it gets between 30% and 35% I definitely put it on the charger. I also charge daily, if it is only 70% I still charge it. Only noticed performance issues when I completely drained it a couple times. These issues heal slowly over time, but not fully, every time you completely discharge you will lose some of your battery capacity that don't come back in 10-20 charge cycles.
When I hear about battery fires I always think about the many idiot around me being clueless and happily overstressing their batteries with facebook and other useless shit.

Easy. Avoid heat.

Except that's not easy at all, is it?

Well, there's your answer.

Overstressing is solved at the hardware level, you can't overcharge modern batteries. Just don't let it get hot.

Batteries today are sturdy, they should last long even if you pay no attention to how you charge them. But the theoretical best is still to not charge them quite to 100% or drain them to 0%.

Yes, letting it heat up from whatever is also bad, but complete discharge is worse and the reaction doesn't stop at a solid enough ,imit you can set by hardware or software. Under 20% the Li starts to associate together forming small plates also forming H2 gas. Atomic H also gets into the grain boundaries in the electrode slowly breaking it off. When you go under 20% you are introducing small permanent damaegs to your battery, it only gets worse while you discharge further.A single complete discharge will give you measurable damage, you get much less battery time but it can heal up in 10 charge cycles. If you regularly do complete discharge then you will quickly see a puffed up battery and/or battery fire. That is the nature of chemistry.
I am not a CS brainlet, I'm an actual material sciences engineer so I know this stuff.

>Yes, letting it heat up from whatever is also bad
You can't agree, and then say the opposite of what I said.
And I was mostly talking about overcharging, which I thought you meant by overstressing. Besides, lower charge voltages prolong battery life.

I never got those people that only depleted their battery to 20%, then recharged it only to 80%.

Yeah sure, the battery may degrade less but you are only using 60% of your battery capacity that way from day 1. Youll only see better battery life than an always fully utilised battery after years and years of usage, whats the point?