How soon do I need to change my iPhone 7 battery?

I've had the iPhone 7 (Bought unlocked from Apple ) since beginning June 2018.

It's been used and charged well. I've mostly charged it diligently between 50 to 80%, and let it run down to 25 every few months, and then charged it up to 100%.

Less than a month ago I updated to iOS 12.1 and I can see that there are fewer bugs and the phone is running pretty smooth.

However, today I went into the battery section and noticed that the Battery Health is now at 99%.

Peak Performance Capability is normal.

It's just been 8 months and there's already a 1% drop in health. Should I expect to have to change the battery before this year is out?

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Clarification Request
What article tells you to run down the battery?

You've found bad advice. Stop doing that since Lithium batteries do not need this. You are needlessly wearing out your battery.

Post was last edited on February 1, 2019 11:22 PM PST

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To recalibrate the OS software

they say it's helpful to run it down to around 25% and charge it to 100 every few months.

Maybe the OS software get tricked into thinking that the battery capacity is lower than it actually is. So, doing this makes it recalibrate its readings of the battery capacity...

But, do you think its not a good thing to do even once every two months or so?

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Bad advice.

At office and home we haven't done this for over 10 years. It looks like outdated advice from the days before Lithium batteries. But it's good for companies that sell batteries and replacement service.

Did I just slam this practice? Yes I did.

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battery life

You may just follow tips to save battery life in daily usage.
The main is to disable Location Services if you don't use it in the moment.
Actually each Apple battery performs well just 1 year, then you have to change it.

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