1999 Escort "Battery light on"

Hey there this is my second post. My battery light on my 1999 Ford Escort just turned on today. The battery was recenetly replaced. What could the problem be? I read it could be the alternator but my manual for the car says electrical component needs servicing, what do you think? Also as I recently posted my car made this weird "clicking sound" coming from the area of the alternator so maybe it is that? Thanks