How to do the battery 100 again

Maximum Capacity of a battery will decrease over time. The only way to restore full capacity is to replace the battery. Apple recommends changing the battery when it is at around 80%

Start by checking your battery's maximum capacity here:

Settings → Battery → Battery Health & Charging → See Maximum Capacity

You can find more information, as well as local prices for battery replacement here:

iPhone Battery Repair & Replacement - Apple Support

maninderpal ~ The only way to get 100% maximum capacity is to 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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