Can I order a new battery

The battery must replaced (usually an entire unit-iPhone swap) by an AUTHORIZED Apple retailer.

If you go somewhere else for this type of repair, the warranty will be voided and no Apple employee will work on that device ever again.

Here is a link to get you an appointment at the Apple Genius Bar:

Genius Bar Reservation and Apple Support Options - Apple

Good Luck!

The Apple Store and authorized Apple Service shops will not sell a genuine battery to a user unless they also install the battery.

A user cannot just buy a genuine battery, he must leave his phone with the shop for the installation.

Amarieexsx Said:

"Can I order a new battery: What’s the cheapest place to get a battery for the iPhone 8"

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Cheapest Place to Get a Battery:

Probably from a retailer. Be careful as to where you get this battery, ask you may get an error of an ungenuine battery. See here: About Genuine iPhone Batteries - Apple Support

Bob Timmons Said:

"The Apple Store and authorized Apple Service shops will not sell a genuine battery to a user unless they also install the battery. A user cannot just buy a genuine battery, he must leave his phone with the shop for the installation."

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Okay, let me reword the heading...

Most Inexpensive Place to Get a Battery Replacement:

Hopefully, that might prevent another user from buying a battery online to save a few bucks and find out too late that it was the wrong battery.......then the user finds out that Apple won't touch the phone.