My iphone 6plus battery suddenly started draining fast

Hi

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 software version:

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

Close all apps on your iPhone and restart it (normally):

• Double-click the Home button, then swipe up on the app previews to close each app.
• Restart your iPhone, iPad, or iPod touch - Apple Support

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

• https://www.apple.com/batteries/maximizing-performance/

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:
  • Use iTunes on your Mac or PC to 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:

• Contact - Official Apple Support
• https://twitter.com/applesupport
• http://www.apple.com/retail/geniusbar/
• https://locate.apple.com

As the issue persists, I suggest that you contact Apple Support or an Apple Authorised Service Provider in India with a view to arranging for your iPhone to be checked and, if recommended, serviced:

• Contact - Official Apple Support
• https://twitter.com/applesupport
• https://locate.apple.com/in/en/

Batteries are going to fail, it's the nature of the technology. That being said, there are things you can do to try to prolong the life, but no matter what, it's still going to happen eventually. It sounds like you're battery is getting to that point of where it is unable to hold a charge like it used to. You should schedule an appointment with a Genius Bar at an Apple Store so that they can work out something with you to get a replacement for you.