I have good battery and alternator but the battery keeps going dead

Parasitic battery drain, specific test to confirm the presents of drain and which circuit is involved need to be performed. Some youtube video's on the subject but need the test for your model as many can damage the brain while performing the wrong test.

Something draining it. Make sure 14 volts is at the battery when running and all main power cables are clean and tight. It might be with car off, at least you hope it is. You need an amp meter or volt meter that can measure amps. I say this because with car running the alternator charges the battery constantly. Off it could pull a small amount of current but all night long it would drain the battery. Keeping in mind your radio and CPU require a very small amount but certainty not enough to kill it.o security system if one hooked up. Hook up meter and read amps. If too high I would start pulling one fuse at a time until you find the largest current drain. Best one first is the radio. Look in all fuse boxes and find the ones with voltage on them then you know what's powered. Note# if you find something you don't think is supposed to be on after the car is off then check it out first. Please use jumper wire that can carry 10 to 15 amps and try not to short it to chassis or anywhere else. If current draw is minimal when car is off then than you have a bigger problem. It's drawing too much during operation. I would start with the lighting system because their routed through the bumpers and frame work. If you don't see any exposed wire than I would find a shop that could run some test on it. PLEASE DON'T crank car with jumper in place. Hook it back up. The car pulls way more current the your meter can handle. You know I had to say that. Can't goto shop right now then just pull your main fuses for the night. I know radio reset. I've had to do it before myself. If you need more info on current draws and hook up procedure just ask. The tech may have seen your model with that problem and he also has access to service bulletins.

What kind of battery is n this make & model 2007 Nissan maxima

Duralast 2015.

I had Napa run a test on the battery and the alternator. Battery he said was good and the alternator was at 13.6 volts which he said was also good

Did you test for parasitic drain on the electrical system.

Battery is super starter premium 35prm coca 550 DC 90