The health of Iphone battery is declining 1% every week.

A week's decline in battery health 1% is definitely abnormal. Generally speaking, batteries can be used for about one and a half years, and some can be used for two years after a long time.

It is suggested that the battery must be replaced when it is close to 80% health, which will actually lose 1% health for one month. Time is four times less, it is better to have after-sales inspection, or don't play with your mobile phone while charging, and don't overuse it.