Batter Issue
I buy an iphone 14 in just one month the battery is 99 percent
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That's absolutely normal, bearing in mind that that value is approximate and, most of all, is related to when the battery (not the iPhone) was new. Start worrying when it goes down below 83/80%.
See also this support article:--> iPhone Battery and Performance - Apple Support and this useful user tip:--> When to charge your iPhone or iPad - Apple Community
Regards
Giulio