Do we need a battery app for our iPhone?

Do we really need a battery app for our iPhone?  (search "battery" from the iOS App Store)
Phishing / Scam
I am more and more in doubt about it.  Even worse, I recently found an app with a new link (with a rocket icon on the upper right corner if you select Memory Boost) that redirect you to a website asking you to give permission (to surrender your security) for them to install a Profile to your iPhone. (Just like your iPhone is a property of their company so they have overall control of your iPhone).  I really suspicious if the battery app is actually a mobile scam / phishing app in nature.
A fallacy of usefulness, and even dangerous
Back to the function of a battery app.  It provides a seem-to-be smart charging method to your iPhone: 1) high speed charge to 80%, 2) continue to charge till full but slowly, then 3) trickle-charge to make use of every charging capacity of your iPhone battery used.  I believe iPhone has provided high speed charge and slow charge already.  So the battery app is actually doing nothing.  Regarding trickle charging, I think it's dangerous. It may over-charge your iPhone battery if you leave it over-night charging.  But without using a battery app, your iPhone will not do trickle charge and will not over-charge the battery.
Any expert advice?

The iPhone charging system is already smart enough to do what the so called App is pretending to do.

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