Changed Battery???

[02X5]

Hey guys...im new to X5world but have owned my x5 for 7months now...Its an 2002 4.4 sport package with all options expect for the phone 84,000 (out of warranty)....anyways i was pumping gas today and when i went to start the jeep it was clear the battery was dead...long story short i changed the battery with a motormaster (canadian tire- only place open) in my garage. Now the battery light is illuminated on the display ...It appears to be driving fine but the battery light wont come off. Im trying to save myself from going to the dealer....any suggestions???