Calibrating battery to preserve capacity

Hello. I've read some posts, tried some apps but never found what exactly I need. So there's a thing: let's say my phone's battery capacity is 2900mAh. Is there a way to calibrate my battery to put, let's say, 200mAh to reserve? So when the battery is charged to a 100%, it would actually be charged only to 2700mAh and would stop charging. This way battery would get less voltage that damages it and would have longer lifetime.
I know that I can download apps that notify me when battery is charged to wanted percentage, but it's not always the most comfortable choice on many occasions.

All the topics, apps about battery calibration are to calibrate 100% to 100%, when I actually want 80-90% to be shown as 100%.

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