each morning after the car is sitting overnight, when is start up the car, it seems to struggle. but after the frist start. it starts fine the whole day. I think its battery issue?

i used to listen to the radio when the car is turned off.

 

When it starts to get cool with autumn, the ECU will choke a bit until it recalibrates. Also, old batteries will struggle once colder climate starts.

 

You can test the battery with a multimeter. Should run at least 12.4 DC to be a strong battery.

 

Mine has always made a weird grinding noise when starting and the temp is below 40 degrees outside. It doesn't do it if i prime the fuel pump by having the key in the on position for a few seconds then pressing the start button. Try that.

 

^ I guess I got to try that because mine grinds on cold days too