The battery of our  team’s  iPhone suddenly  started draining very faster and it hardly lasted for a day. I tried several possibilities to bring it back to the normal condition, by trying every solution that was discussed in forums and blogs. But after a week, I remembered that I changed the Auto-lock settings to never. So before trying other options to get your battery back to the normal state, try this.

1. Go to Settings.

2. Set the Auto-Lock to some period of time, if it is Never.

3. If this is already set to some time period, then you have to try other possible ways.

And to enhance the battery life of your phone, follow the guidelines provided by Apple.