More iPhone ways to save the battery. Ken you came up with a great way to save some iPhone battery by putting the iPhone face down. Are there others?
You can do a search for "ways to conserve your iPhone or Android phone battery".
One interesting suggestion is you will save battery if you remove the application from memory. This is actually not going to help and in many cases it will cause additional battery use because if you need the app again it will have to go through the efforts to reload the app and this will most likely use more battery.
Another suggestion is Turn on Low Power Mode" available on iOS 10 and iOS 9. This suggestion is a way of identifying a bad application causing significant battery usage. You can then decide if you want to use this application.
Go to Settings > Battery and wait for your Battery Usage report to load up. This will let you check your Usage and Standby times. To test your battery, make a note of the usage and standby times and then put the device to sleep by pressing the on/off switch at the top. After five minutes check the change in the times. If your device is working correctly, the usage time should have have gone up by less than a minute, while the standby time should have gained five minutes. If you see more than a minute increase on the Usage time, something is stopping your phone from sleeping and you have a battery drain problem. Check the applications currently loaded by double clicking the Home button and look at the windows open.
There are many more. Do a search or look here.