2008 g35.. if i ever do anything to my car and leave the door open the battery dies. this is my 3rd battery in 1 year. if i even vacume it out there is a chance it wont start. yet it starts fine everyday as long as door isnt open

 

if you leave your doors open for a long time does the dome light eventually turn off? did you change them out with leds or anything?

 

Pick up a battery hydrometer to check the specific gravity of each cell to determine if they accept a full charge.



If you had to replace three batteries in one year either you obtained defective batteries or you are not using your vehicle enough to keep them fully charged.
Have you ever measured the alternator voltage across the battery with the engine running? Should be 14.4 volts.
What is the CCA rating of the batteries that you purchased?
Should be at least 700 CCA or 900CCA if you frequently use electronics without the engine running.

Telcoman

 

Two things, have a mechanic check to see if your alternator is putting out the 14.5 volts as needed. If it's putting out anything less your battery won't last! You could also have a short somewhere dragging your battery down, mechanic can also check that.
Gary