I have a 2006 Mazda 3 4s w/ 84000 mi. every thing seems normal . Recently the battery went flat so I put in new one works fine except if the car sets 6-7 days battery goes flat. checked batt and it is fine, checked old one it is also OK . only thing I can see so far is constant blinking key light in dash. Any answers ?

 

You need to carry out a current draw test.

 

Thank you G_R I'll do that.