Why does my iphone 3gs shut down when battery gets to 80%?  have installed new battery and nothing changes?

Why does my iphone 3gs shut down when battery shows 80%.  a couple of months ago is shut down at 60% but has continually gotten worse.  this was before 5.0.  i took it to a repair man and he tried a used battery, a new battery, and the original battery.  nothing helped.  5.01 didnt help either.  What is my problem?

Fully discharge the battery (till it shuts down and won't turn on) and then fully recharge it (100%).  This will recalibrate the battery meter.  You may need to do this a few times.

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