After the initial charge of battery ended, when I try to charge it never terminated the charging (try for hours). When I disconnect it say always "low battery" and the level is always red. Anyone with same problem? I try another battery (from nokia 9500) but same result. May this software problem ?? Exist an method to reset completly the machine ?? (not initial setting reset, a total reset)

Have your tried charging when the device is off?

Yes, it says that charging, but never end the charge. When disconnect the unit and turn on, the level battery same poor, red indicator, and few time after says low battery

Have you tried to reseat the battery? Perhaps it is not making a good contact with the leads.

Don't know about total reset, but I haven't experienced that kind of behaviour, though one time I noticed when leaving several applications running when charging, the charger wasn't able to add more juice to the battery. Now I usually close apps before charging. Maybe you should contact Nokia, might be something wrong with your hardware?