Why battery percentage does not reach to 100 percent in iphone?

Though i'm not feeling any drainage problem
but let say it reaches to reaches 99 percent it won't increase to 100 percent
if i off/on phone it shows 100 percent and "plug" sign means its fully charged remove charger

Are you letting it charge long enough? Are there apps still on while you're charging? Turn your phone all the way off and it will get there.

At the Apple site where they discuss battery life, they recommend that you allow the phone to get below 20% charged at least once per month for it to correctly reflect the percentage charged. So maybe you are not doing that resulting in an incorrect reading.

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