Precor EFX 546i Elliptical Version 4 "location precore 546 battery" Questions

...546, MANUAL not electric and I either need a new battery or a battery charger. What do I do without the serial number? Precor Serial # Locations Type of Unit Serial # Location Treadmills Located on ...

battery has been replaced but the keypad only lights up for a second when you start pedaling....it then continues to flash on and off....no error code given My Precor Elliptical EFX 546 Timer Stops ...