My iPhone battery degraded

Sababaramidze ~ Have the battery replaced:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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Your battery needs to be replaced at an Apple Store or Apple Service shop.

iPhone Battery Replacement - Official Apple SupportOfficial Apple Support › service › battery-power

It's time to make arrangments with Apple to have your battery replaced:

Genius Bar Reservation and Apple Support Options - Apple

Consider replacing your battery here : iPhone Battery Repair & Replacement - Apple Support