MacBook Pro battery indicator and stand-by problems

The battery indicator on the left side of my Macbook Pro shows battery empty all the time, evrn though the battery is charged. It also takes two or three minutes to stand by. Both the problem started at the same time so I think they may be related. What could be the cause of the problems?

Hi, thank you for the quick response.
SMC reset did not work. Here's the power informations:
Informazioni batteria:
Informazioni sul modello:
Numero di serie:    W02444G5YD3LC
Produttore:    SMP
Nome dispositivo:    bq20z451
Pack Lot Code:    0
PCB Lot Code:    0
Versione firmware:    201
Revisione hardware:    000a
Revisione cella:    165
Informazioni sulla carica:
Carica restante (mAh):    4553
Carica completa:    Sì
In carica:    No
Capacità a carica completa (mAh):    4615
Informazioni sulle condizioni della batteria:
Conteggio cicli:    369
Condizione:    Normale
Batteria installata:    Sì
Amperaggio (mA):    -16
Voltaggio (mV):    12290
Impostazioni d’alimentazione del sistema:
Corrente alternata (AC):
Timer per la messa in stop del sistema (minuti):    1
Timer per la messa in stop del disco (minuti):    10
Timer per la messa in stop del monitor (minuti):    1
Riattiva se cambia la corrente alternata:    No
Riattiva all'apertura dello schermo:    Sì
Riattiva se connesso a LAN:    Sì
AutoPowerOff Delay:    14400
AutoPowerOff Enabled:    1
Fonte di alimentazione attuale:    Sì
Lo stop del monitor usa l'attenuazione di luminosità:    Sì
PrioritizeNetworkReachabilityOverSleep:    0
Standby Delay:    4200
Standby Enabled:    0
Batteria:
Timer per la messa in stop del sistema (minuti):    1
Timer per la messa in stop del disco (minuti):    10
Timer per la messa in stop del monitor (minuti):    1
Riattiva se cambia la corrente alternata:    No
Riattiva all'apertura dello schermo:    Sì
AutoPowerOff Delay:    14400
AutoPowerOff Enabled:    1
Lo stop del monitor usa l'attenuazione di luminosità:    Sì
Riduci la luminosità:    Sì
Standby Delay:    4200
Standby Enabled:    0
Configurazione hardware:
UPS installato:    No
Informazioni sul dispositivo di ricarica CA:
Connesso:    Sì
ID:    0x0100
Wattaggio (W):    60
Revisione:    0x0000
Famiglia:    0x00ba
Numero di serie:    0x009977de
In carica:    No
I'm sorry it's in italian but everything is in the same place as the english one, so there shouldn't be any understanding problem.

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