iPhone Battery Charging Pattern, Which is Recommended?

Bro charge podurathu battery percentage below 40 irukum pothu than poduran sometimes 75 percentage irukkum pothum poduran doubt enna enda ithala charge 75 mela irukum pothu pota battery issue ethum varuma illa battery 40 percentage pona apram than pdlam

hello bro, charging pattern porutha varaikum, romba ellam paaka vendiyathu illainga. just 20% around varumbothu change pannunga. above 80% or 100% reach pannalaam. not a problem. iPhone 7 la irunthu intha charging pattern thaan naan follow pannitu irukean. so far no issues bro.