Battery probz

Hi guys. I've a little problem with my 3315.after flashing, all worked, but the phone turns off without saying "Battery low" and things like this. I think it's a problem of "Energy management", and think also that I can solve it with a "Energy management calibration". I've got WinTEsla, but I haven't the service battery !!! What can I do ? Can I go with my modified phone to a nokia centre and answer for a calibration ?
Thanks and good flashin' to everybody

Beppe

Woah, I reply to myself....

Another info : where are power calibration values stored ? in eeprom ?