Why does my iphone 3 keep shutting off by itself

my iphone 3 has been shutting off by itself. whenever i use it, a battery appears on the screen showing very little battery life, when it has 100% battery life..when it finally  goes back on, a third of the life is gone...doesnt matter whether im texting, online or tallking it shuts off, any suggestions on why it soes this?

Basics from the manual are restart, reset, restore from backup, restore as a new device.  Go through each step in succession until your issue is resolved.

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