Hello Igor,
Thank you for posting in the Apple Support Communities. I would be concerned too if my iPhone were heating up and losing battery life quickly. There are a few articles I found that might help with what you are experiencing on your iPhone.
The first thing I recommend is quitting open applications. You can find an article with the steps to that here:
iOS: Force an app to close
http://support.apple.com/kb/HT5137
If you are still experiencing the same issues on the iPhone after quitting all the apps that are currently open, follow the steps below:
- Click ( www.apple.com/batteries/iphone.html) for tips on how to prolong iPhone's battery life.
- Try turning iPhone off and then on again.
- Connect iPhone to iTunes and restore iPhone.
- If the screen shows a low-battery image, the battery is low on power and needs to charge for up to ten minutes before you can use it.
- When charging iPhone, make sure to leave it charging until it is fully charged. You'll know the battery is fully charged when the battery icon in the upper-right corner of the screen looks like this
.
Note: When charging using a computer, don't connect iPhone to a keyboard. Also, the computer must be turned on and not in sleep or standby mode. If iPhone is connected to a computer that's not turned on or is in sleep or standby mode, the iPhone battery may drain.
You can find the full article here:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
I hope this helps!
Best,
Sheila M.