Iphone4 shuts down at 80% battery

I have a iphone4 that shuts down every hour or so at about 89-91% battery.  You have to plug it into the wall to have it function.  What is wrong and how do I fix it?

I have reset the SMC at some point between the last time this happened (today) and the time it happened before (over a month ago). Do you think some glitch could have occurred between the last SMC reset and today that affected the power logic board, or whatever controls this? I'll try resetting the SMC today then letting the battery drain right after.
Thought it might also be useful to say this: The date was reset to January 1, 2015 and the clock to 4:00AM after the last time it died, despite automatic date/time being enabled. I fixed it manually. And this laptop DOES have two other problems: The keyboard lights sometimes don't work, and the screen freezes entirely (either for a few seconds or forever until I reboot) on very rare occasions. I've always babied this machine, keeping the battery charging whenever possible and taking great care not to bump it, so it shouldn't have suffered any damage.

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