How can I recalibrate or reconfigure my Treo Pro's battery meter

[bazijoe]

Hi, I'm new here. I'm searching for a registry hack or an application for recalibrate my Treo Pro's battery meter.
I've bought a new extended battery (2400mAh). It works very well for a long time. After I disconnect my phones from the charger at the time of full charge, the battery meter runs from 100% to 0% during 3 days. In the following days my phone keeps on working well, but the battery meter remains on 0% and my phone annoying me charging messages. How can I reconfigure or recalibrate my phone's battery meter ? Thank you for your help.