Why does battery suddenly go to 0 and phone turn off?

I have an iPhone 5 and noticed the following. My battery is showing 30% or more; I start taking photos (with flash) and all of a sudden (within minutes) the phone turns off as if it was completely discharged. I plut it in, and within 5 minutes the battery is showing 40%.  The fast charge time and the very unexpected turn-off make me think the battery wasn't really at 0. Am I wrong - could a few flash photos drain a 30% battery to 0, and could an empty battery charge up to 40% in a few minutes (being plugged into a car charger)? Or does my battery need to be recalibrated somehow?

I found out that after it shuts off, the first time I hold the buttons, it shows a charge symbol and doesn't turn on. But if I hold the buttons again, then it does boot! Unfortunately, it then shows 4%, not 30%. I let it run down again, plugged it in the wall for 4 hours like you said. Let's see what it does now. It's just weird how it unexpectedly shuts off long before it gets to 1%.

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