Battery warning light on does it control the ecm
 

I have an 08 with the 2.4 engine. The battery was going dead and we would jump start the car with a charger. while it was running with the charger on it the light came on. Replaced the battery but the light is on. Also I hooked a scan tool up to it to check for voltage and it wouldn't read for codes. Did we blow a fuse and does that control the ECM to