Hello, i have question, here the chronology :

I recently getting a new battery to my phone, it's was higher capacity than the old one, after installing it's shows 55%, worry about false indicator, i tried fast boot for few times, but it's kinda messed as my battery going from 54% to 49% in a second, trying to fix that i tried hard reboot for few times, now no more sudden decrease.

Next im installing Battery Guru and discharge to below 15%, then charge it again till the app says it's true 100%(it's like a hour or so after system says 100%), but the battery health shown in app only 75%.

Wondering if it calibration problem or my new battery is just bad, im then discharge my phone till it force turn off, i tried turn it on again but it didn't turn on and show 0 battery instead, then while the phoned is turned off, i charge it to 100% plus leave it charged around a hour, after that i unplug and turn on.

Now the question is, at that point, did i successfully re calibrate my battery or do i need to do anything else? or did i do something wrong or not?