My iPhone battery is draining fast without any use

TracyFco Said:

"My iPhone battery is draining fast without any use: My battery is draining fast after updating to newest iOS. Anyone else having this issue."

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No. I am not having this issue.

Troubleshooting iPhone Battery Drain Info:

The iPhone battery will drain, unless it is plugged in and charging. With lots installed, the charge would be slower. As for how fast it would drain the battery, that would depend on the battery health and the volume (sound) you use.  Go Here: iPhone Battery and Performance - Apple Support - Scroll down to "Your battery's maximum capacity"

Troubleshooting the Battery:

• iPhone Battery and Performance - Apple Support

• Charge and Monitor the iPhone Battery - Apple Support

• About the Battery Usage on your iPhone - Apple Support

• About Optimized Battery Charging on your iPhone - Apple Support

• Use Low Power Mode to Save Battery Life on your iPhone - Apple Support

• If you see "Your iPhone Battery may Need to be Serviced" - Apple Support

TracyFco wrote: "my battery capacity is at 87%. I assume it has the original battery. I’ve had the phone for a little over a year. Bought the phone through a phone carrier."

The iPhone 6s was made 2015-18 and battery capacity typically declines by 1-2%/month. So an original 3½ year-old battery should have declined by more than the 13% yours indicates.

But 13% is consistent with having "the phone for a little over a year." For that reason it's more likely to be a replacement battery. Hopefully the carrier used a genuine iPhone battery:

About genuine iPhone batteries

...If not, the nongenuine iPhone battery could be the explanation for the fast draining you're seeing. Consider having your iPhone's battery examined:

iPhone Battery & Power Repair

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Tracy ~ The long process of applying an iOS update to an old iPhone with a weak battery can be the proverbial "straw that broke the camel's back." So...

Does your iPhone 6s still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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