Why does my iphone battery drain 50% overnight?

Hi

There is an iPhone 6s Program for Unexpected Shutdown Issues. Follow the instructions here to check your iPhone's eligibility for a free battery replacement and, if appropriate, to arrange service:

iPhone 6s Program for Unexpected Shutdown Issues - Apple Support

If your iPhone is not eligible for the program, then - depending on the nature of the issue - your iPhone may require battery service. Before contacting Apple, try the following steps:

If you have not yet done so, update your iPhone to the latest version of iOS (starting by making a backup):

• Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support

Restart your iPhone (normally):

• Restart your iPhone, iPad, or iPod touch - Apple Support

Check which apps are responsible for the battery usage:

• Go to: Settings > Battery > under Battery Usage, select the Last 24 Hours tab.
• Address any issues with potentially problematic apps (such as by removing and reinstalling them).

Follow Apple's tips for maximising battery life, as detailed here:

• Batteries - Maximizing Performance - Apple

When charging your iPhone, follow the instructions in the following support article, including:

• Checking the charging port for any debris.
• Using only a genuine Apple cable or an Apple-certified (MFi) cable.
• Apple recommends using the supplied USB Power Adapter.
• If your iPhone, iPad, or iPod touch won't charge - Apple Support

Check whether the issue persists after restoring your iPhone to factory settings:

• Back up your iPhone (you may wish to encrypt the backup, if using iTunes):
  • How to back up your iPhone, iPad, and iPod touch - Apple Support
• Restore it to factory settings, with a fresh copy of iOS:
  • Restore your iPhone, iPad, or iPod to factory settings - Apple Support
• Check whether the issue recurs before or after restoring from backup:
  • Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

If the issue persists, I suggest that you contact Apple Support (mail-in service may be available), make a Genius Bar reservation or visit an Apple Authorised Service Provider for assistance, including - if recommended - to arrange for your iPhone to be checked and serviced:

• US: iPhone Service Answer Center - Apple Support
• Elsewhere: Apple - Support

Hi

Some iPhone 6s have a battery fault Go to Support.apple.com

They will send you a post paid box to return iPhone for battery check /replacement.

Mine took 4 days use simcard in other phone if you have one.

Cheers

Brian 🇬-1F1E7;