Q: iPhone 4 hot and low battery life?

Hello Bmay121,

Thank you for providing the details about the issue you are experiencing with your iPhone.  I found a couple of resources that may help address this issue.

First, I recommend following these steps if your iPhone has a short battery life:

Battery life seems short

1. Click ( www.apple.com/batteries/iphone.html) for tips on how to prolong iPhone's battery life.
2. Try turning iPhone off and then on again.
3. Connect iPhone to iTunes and restore iPhone.
4. 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.
5. 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

You can also find useful information about the iPhone's operating temperatures in this article:When troubleshooting temperature, please refer to the following article:

iPhone, iPad, and iPod touch (4th generation): Keeping device within acceptable operating temperatures

http://support.apple.com/kb/HT2101

When using the device or charging the battery, it is normal for it to get warm. The exterior of the device functions as a cooling surface that transfers heat from inside the device to the cooler air outside. If the interior temperature of the device exceeds the normal operating range, the device will protect its internal components by attempting to regulate its temperature. If this occurs, you may notice the following:

• The device stops charging.
• The display dims or goes black.

If the temperature continues to be a concern, you can isolate the issue by restoring your iPhone as new:

iTunes: Restoring iOS software

http://support.apple.com/kb/HT1414

Thank you for using Apple Support Communities.

Best,

Sheila M.