My iPhone 6 battery depletes to fast. 10 minute face time call drains the battery and needs to be charged after a 10 minute or 20 minute call

My iPhone 6 battery . . . .

iPhone 6 is an outdated iPhone (9 september 2014), > 7 years old, which also affects the battery life. That may be the cause of the problem.

It is no longer possible to have the battery replaced at Apple, see here: 

iPhone Battery Replacement - Official Apple Support

You may want to consider switching to a newer type of iPhone.

Check iPhone type -> Settings -> General -> About. 

When it is a iPhone 6S you can still replaced the battery.

The battery can be replaced by Apple or an Apple Authorized Service Provider.

See this Apple article:

iPhone Battery Replacement - Official Apple Support

See also -> If you are going to replace the battery, read this Apple article:

Get your iPhone, iPad, or iPod touch ready for service

Get your iPhone, iPad, or iPod touch ready for service - Apple Support

Pattyasds wrote: "Yes"

Okay, being the original, 6½ year-old battery, it's certainly at the end of its life. You don't need to answer my question regarding its Maximum Capacity %. Have the battery replaced and all will be well:

iPhone Battery & Power Repair

About genuine iPhone batteries

(Articles found by searching Apple's Knowledge Base.)

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Pattyasds wrote: "What does maximum capacity percent mean?"

Apple explains what it means here:

iPhone Battery and Performance - Apple Support

That your iPhone 6s charges to 100% is irrelevant. That it drains quickly is a common behaviour of a weak, aging battery in need of repkacement.

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elago225 wrote: "My iPhone 6 battery drain too faster after charge. And the camera is poor. The phone is 3 months old"

elago ~ Your iPhone 6 is not 3 months old; it's 7½ years old!

What's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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Darrell Johnson wrote: "how much would it be to replace the battery in my iPhone 6?"

Darrell ~ Approx. $49 or equivalent:

iPhone Battery & Power Repair

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Hello my iPhone 6splus battery is draining too fast

Pattyasds ~ Does your iPhone 6 still have its original battery?

Also, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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Read my previous post.

My iPhone 6 battery drain too faster after charge. And the camera is poor. The phone is 3 months old

how much would it be to replace the battery in my iPhone 6?