Battery health

Try Force-Restarting the device and see if it resets the counter. Hold down Volume Down and Sleep till an Apple logo appears onscreen, release and let it finish starting.

BTW, that's for an iPhone 7, which you enlist. Nowadays there are various ways of doing this depending on model: https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios

Leppmargus wrote:

Is it normal that i bought my iphone last month and the battery health is already showing 98%?

Yes, it's perfectly normal. The Battery Health indicator is an estimate.