My iPhone 4s shows battery of 40%, but then turns off.  When plugged in to charge, it shows the 40%.  Why?

How to extend battery life?

Hi Micsher,
Welcome to the Support Communities!  The information below may help you troubleshoot your iPhone battery life issue:
iPhone Battery and Power - Apple Support
http://www.apple.com/support/iphone/repair/battery-power/
Battery & power
Is your iPhone battery draining too quickly or not holding a charge? Try restarting it first. You can also adjust several settings to extend the battery life of your iPhone.
Restarting your iPhone
Hold down the Sleep/Wake button on top of your iPhone, then drag the slider to turn it off. Press the button again to restart.
The article below explains how to get the most out of the battery life of your iPhone.  I've included some of the highlights below ... click on the link for complete information.
Apple - Batteries - iPhone
http://www.apple.com/batteries/iphone.html
Optimize Your Settings
Depending on how they are set, a few features may decrease your iPhone battery life. The tips below apply to an iPhone running iOS 7.0 or later.
Enable Wi-Fi: Having Wi-Fi enabled helps consume less power when doing activities that access data. Go to Settings > Wi-Fi and log in to a Wi-Fi network.
Adjust brightness: Dim the screen or turn on Auto-Brightness to extend battery life. Turning on Auto-Brightness allows the screen to adjust based on lighting conditions.
Fetch new data less frequently: The more frequently email or other data is fetched, the quicker your battery may drain. To fetch data manually: Go to Settings > Mail, Contacts, Calendars > Fetch New Data and tap Manually.
Turn off push notifications: Apps with Push Notification alert you of new data, which may impact battery life. To disable, go to Settings > Notifications, choose the app you want to disable, and do the following:
Change Alert Style to None.
Turn Badge App Icon off.
Turn Sounds off.
Note: New data will be received when you open the app.
Minimize use of location services: Apps that actively use location services, such as Maps, may reduce battery life. You can see which applications have recently used location services by going to Settings > Privacy > Location Services.
Use Airplane Mode in low- or no-coverage areas: Your iPhone always tries to maintain a connection with the cellular network, which may use more power in low- or no-coverage areas. Turn on Airplane Mode to increase battery life in these situations.
Viewing Usage Statistics
Knowing and understanding your iPhone usage can help you better manage your battery life. To view your iPhone usage statistics, go to Settings > General > Usage. Under “Time since last full charge”:
Usage: Amount of time iPhone has been awake and in use since the last full charge. iPhone is awake when you’re on a call, using email, listening to music, browsing the web, or sending and receiving text messages, or during certain background tasks such as auto-checking email.
Standby: Amount of time iPhone has been powered on since its last full charge, including the time the phone has been asleep.
Cheers,
- Judy

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