Since new update 15.6 my battery drains FAST!

You may get better and prompt responses if you may kindly provide the iPhone Model that you have and the iOS version if it is known to you and re-post.

Millions of users have updated iOS 15.6 and unless you state what the issue is many in this forum may not be able to respond positively to the issue faced by you. 

With the limited information that you have provided, It is hard to even guess the problems faced by you. 

You may get faster and better responses to your query by --> Writing an effective Apple Support Commun… - Apple ...

Please re-post with detail so that someone else can help.

rosanneheinicke Said:

"Since new update 15.6 my battery drains FAST!: Why does my battery drain so fast after 15.6 update?"

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Troubleshooting iPhone Battery Draining:

Provide Apple Feedback:

Do your Part: Report this update issue to Apple.  Apple Support will not get back to you directly, but the more feedback they receive on this, the more they will know what is going on and what needs to be fixed.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment On: When you came across this, and how you have troubleshot it, thus far
4. Proceed from there as necessary.

II. 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"

III. 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

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

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

Hello. These days, apple is patching up an update called “iOS 16”. They are trying to remove all the bugs from iOS 16 so it can be ready to be released to the public. The majority of people working at apple are now focused on iOS 16 while minimal amounts are focused on iOS 15. So apple is not really focused at iOS 15 now. After a few weeks, iOS 16 will be released and your battery issue will be fixed. Sorry for any inconvenience. Hope this helps! Please press the “helpful” or “best answer” button to help me out! Thanks!

What was your earlier iOS?

it Was iOS 15.5.

This is not the right forum to discuss beta

When you experience an issue or something that does not work as expected in beta, send your feedback directly to Apple with Feedback Assistant.