My mother has a Galaxy S3 and recently shes been experiencing problems with her battery, after the phone charges to 100% it dies after about 15-20 minutes. When i went into the the settings to see what was eating up the battery it says that Android OS is using up more battery life than the screen which leads me to think that something is turned on in the settings somewhere that is dramatically decreasing the battery life. Does anyone know whats causing this? Or is it possibly a faulty battery or charger? Ive attached screenshots of the battery chart.