Same for me – I never got Battery Bar Pro to show a charge/discharge value other than zero. (admittedly I didn’t have it installed for long – among other things it uses mWh units incorrectly when it would seem to be really showing mAh estimates. This didn’t inspire confidence in it’s coding 🙂 )
The inbuilt Windows battery indicator does *eventually* give an estimate for remaining charge/discharge time but it seems to take an overly long time at a steady drain/charge rate for it to finally get around to calculating and displaying an estimate.