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Help Phone believes battery is low, when fully charged

So I had a very strange event happen just a few moments ago. Phone fully charged, and I have juice defender installed.

My only recent additions have been juice defender and 3g watchdog.

So long story short, I full charge my phone and an hour later my life remaining is 1H~. Awhile later I go to check something on my phone and I can't get it to turn on. I plug in the charger, still nothing.

Note that, the battery bar and icon both show completely full the entire time.

So I take the battery out, put it back in, and the phone turns on. At this point, i check my phone's battery life again and it says 4 MINUTES!, but since then it has slowly risen and is at about 30 minutes now.

What on earth caused this? Did I just jostle the battery out of position somehow? Anyone else had this?
 

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