Are you 100% positive you have updated yout prs-500 with the latest firmware update? Because the latest(3rd) firmware completely cured battery meter problem, although the native firmware(1st) and the first update firmware(2nd) messed up battery meter.
Maybe you updated yours prs-500 with the first update?
Also, when you say
Quote:
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And when I charge it I do a full night charge
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Do you do it with a wall charger or via USB?
The latest version is 1.0.03.07170
To check what firmware version your reader currently has navigate to the main menu on the reader (where you have Continue Reading, Books, By Author, etc.,), choose Settings - 0 option, then choose About - 4 option. The very first line will tell you the firmware version.