iPhone 17 battery draining rapidly despite troubleshooting

"I went back to the seller, but unfortunately they told me as I have only had it a week I need to give it a second week"

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Thank you for the followup reply.

Returning this to a Seller:

The accepted date of return is the discretion of the seller. So, if a retailer, maybe speaking to the store's manager would be a reasonable workaround.

Learn from This:

Next time you go about purchasing such an expensive Apple device, I strongly urge you to purchase it from Apple, and none other. Despite where it was purchased, you might want to see if purchasing AppleCare for it is an option to you. Note that you only have so much time to do so from the original data of purchase, and note it may not be available in all counties and regions: https://checkcoverage.apple.com/

“iPhone 17 battery draining rapidly despite troubleshooting: […]While I was at work it drained 30% while not being on it. I’ve tried resetting all settings, force restart, turning off every setting I’ve been told to, deleted heaps of iCloud data etc. there’s been no recent updates the last few days and it’s on IOS 26.01 the screen time is also only 3 and a half (ish) hours. update- my phone now has 4 hours of screen time and it’s on 24%.“

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Troubleshooting a Draining iPhone Battery:

A. 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.

1. Go Here: iPhone Battery and Performance - Apple Support
2. Scroll Down: to "Your battery's maximum capacity"

B. Verify the Baterry Health Percentage:

Apple recommends you get a new battery, once the Battery Health reaches 80% or lower. When the Battery Health is 80% or lower, it is time for a new battery. Unfortunately, these if no way to know how, nor when, then percentage decrease occurred. So see if it tine for a new battery...

1. Go To: Settings
2. Tap: Battery
3. Tap: Battery Health
4. View: [the percentage]
5. Is it 80% or less?  If so, it is time for a new battery.

C. 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

D. Report this to Apple

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: on when this all began, and how you’ve troubleshot this, thus far. Include the URL of this thread.
4. Proceed from there as necessary

“iPhone 17 battery draining rapidly despite troubleshooting: So I got my iPhone 17 exactly a week ago, the battery hasn’t been too bad up until today.[…]”

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New iPhone Battery Drainage:

So, who’s the seller?

A. If Apple:

If Apple, then I recommend you go through them. Given your location, you only have so much time to perform a return, and AppleCare for your iPhone may or may not be an option for you. So, find your Serial Number and enter it here, to see if purchasing AppleCare is an option to you: checkcoverage.apple.com.

Apple Support Contact Us Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary

B. If NOT Apple:

Go through the seller, perhaps considering a return. Do so accordingly, but also consider using this link by Apple: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support