A couple of things to try to improve your Droid Incredible's battery lifeThis article contains unofficial information.
Another way to make sure that your Droid Incredible is overflowing with electric juice is to open the Desktop Clock app before charging the phone. Hit the back button to get to the more detailed part of the application and then plug in the phone. At the bottom right will be a reading that shows you the percentage of the battery that has been charged, but more importantly, doing this allows the device's battery to get fully charged.
If you have been having issues with the battery on your Droid Incredible, try these suggestions and let us know if you get any improvement. Droid Incredible owners have been raving about the phone with the exception of the battery and we would expect a firmware update to address this issue eventually. In the meantime, there are homemade fixes like those above that might help you squeeze some more life into your phone.
HTC Droid Incredible Specifications | Review
source: AndroidForums, incredibleforum via Androinica