Why does my iPhone 3GS turn off when the battery charge is only as low as 70%?

After my iPhone 3Gs has been fully charged, whenever that charge drops to the 50% to 70% range, the phone turns off.  When I try to turn it on again, the Apple icon appears the first few times, followed only by a blank screen each time -- the home button does nothing.  Beyond those times, when I try to awaken it, I can see a faint design that includes a plug, a red battery and suggests it is out of charge.  This also happens if I depress the awake and home buttons concurrently.

Let me know if I should start a new discussion instead of opening a new topic here.
My wife's iPhone is the same vintage as mine 3Gs, but has never had the battery problem.  Its affliction instead is that it cannot detect WiFi networks unless it is quite close to the source.  Often, when my iPhone not only detects but shows a maximum cells connection with a network, hers cannot detect the network at all.  In contrast, her iPhone seems to detect ourcellular carrier just as well as mine does.
Is there any help for this affliction?

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