My iphone will show 1% and then 0 and go off.  I can't turn it off again because it shows the battery is dead.  When I plug in the charger for 5 or 10 seconds,  it might show 40% battery.  When I unplug it,  I have 40%!!  Why does it go dead for no reason

My iphone 5 battery life at the most inconvenient times drains down till the phone turns off.  When I plug in the charger for just 5 or 10 seconds,  it will often show 35 - 45% left!  I unplug the charger immediately and I have 45% battery life!  That means I always have to have a charger with me in case it quits!  I can't always do that.

The % counter isn't always accurate.
I'd reset the phone, which might help make it more accurate. (press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears).
You might also try restoring the phone from a backup.

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