I have an external battery charger for 800w batteries. My old 800 battery works fine in my pre, but the charger will not charge the battery that came with my pre. It doesn't even acknowledge that the pre battery is in the charger.

Is there some fundamental difference in the battery that makes it incompatable with the old charger? If so, why does the old treo battery work in the Pre?

Has anyone else encountered this? is there a work around?