fast charging vs normal charging cellphone,damaging battery?

[paparazzo79]

Hi friends.
I see there are many clever people here.
I purchased used Note 10 plus phone,and it doesn't have good battery cuz it's been used probably more then a year.
Since I'm not an expert into phones but my own thought is that fast charging with high current wears out battery more quickly and damages cells compared to regular charging.
I don't need fast charging at all so I disabled that option in phone,since I don't care if my phone will charge 1h or 2.5 h (with regular charging).
But want to ask does fast charging damage the battery cells as time passes by.
I think the charger uses 3 A at fast charging at that is really too high current for a battery of 4200mAh.
Correct me if I am wrong,but that current is used in cellphone batteries who have more cells and high capacity.
So I disabled the fast charging option and I like my battery to charge with lower current slowly and I don't care how long it will take.
I also charge the phone while it's off,and won't drain battery below 15 %.
I installed Accubattery which reccomends me charging to only 85 % which gives it lowest possible wear out cyle.
Is that good idea?
Thanks in advance.

[Sametbey]

Re: fast charging vs normal charging cellphone,damaging battery?

Li-ion batteries like to be charged with low current values. Therefore, if you have no time limit, it should be charged with the lowest possible current rating. Another rule of thumb with lithium-ion batteries is that you use the battery between 20% and 80% whenever possible. We recommend that you charge your batteries to near full capacity after each use.

[Askic]

Re: fast charging vs normal charging cellphone,damaging battery?

Li-ion batteries like to be charged with low current values. Therefore, if you have no time limit, it should be charged with the lowest possible current rating. Another rule of thumb with lithium-ion batteries is that you use the battery between 20% and 80% whenever possible. We recommend that you charge your batteries to near full capacity after each use.

And what about Li-polymer batteries used in Macbooks? Should they also be used between 20 and 80%? Is the same Li-Ion best practice also applicable for Li-Polymer?