2015 vw jetta with only 65,000 miles won't start

It counts two aspects for a battery to "live" long time: the time between two successive starts to be at a distance as long as possible: it is not the case if we stop the car and start it 20 times a day, in the city or start it and we go 400 km continuously. At each startup the battery provides a huge current to rotate the engine (easier on gasoline and harder on diesel engines), so if the battery provides power to start it must be recharged by the alternator / generator of the car, just as at starts often the power consumed at startup will not be able to be restored because the generator of the car does not have the necessary power in the short time, it is made to power the consumers and to charge the battery in time. that 5% back, provided you gave him the time, approx. 20Km of road running (depends on the alternator and battery capacity and and what other consumers are using the car while sharing the battery charging current. However, if you stop and restart immediately there is not enough charging time and you reach the battery below the normal threshold of use, which significantly reduces its life. Also, when the car is parked, all consumers must stop, no light bulbs, no radio, no gadgets. As an example I can tell you that at an Audy the battery was almost empty in a few days just because the doors were not locked with the key, just that it was in the garage and the computer remained connected, "waiting" because until the key was locked or radio remote control, the computer was "on hold" and consuming more than in stand-by with locked and locked doors ... it was quite difficult to find the cause. If you do not use the car for a long time the battery must be recharged with a rectifier, after 30 days of inactivity must be charged for several hours. A maximum charged battery has (measured at least half an hour after being disconnected from the charger) 12.6v -100% charged ... 12.5v-80% charged ... 12.4v -50% charged and below this value must be charged, its use under this voltage drastically reduces its life ... Conclusion: monitor the charge of the battery and the consumers of the car, personally check with a measuring device (it's very easy), with the engine started that the voltage on the battery terminals is 14.2-14,3v at 2000rpm without consumers (radio, AC, etc) and at least 13 , 6-13,7v with the consumers on: headlights, AC, radio, etc) I do not speak here about the winter periods when the above measures must be implemented and carefully monitored.

Your battery is over four years old and is at the end of its life. Especially if you two keep leaving interior lights on and slowly running it down. Don't buy a cheap battery, please. Buy the best made you can afford. It's too important to skimp on.

Yours battery can still be saved if you put a minimum of 24 hours in a car battery charger and in the future to avoid letting on the bulbs or any other possible consumer when the car is stopped, If it is the original battery of the car (has not been changed in the meantime) then the battery is quite performance, even built to work in advanced discharge conditions, of course not for long periods. I have the same type of battery on one of the cars from 2012 and it works perfectly. On another car I dropped a battery after 9 years and still works perfectly but I considered it "morally used" .. everything is from its exploitation. Of course for this you need a quality battery and care in its operation and then you have good years without problems.

So guys it turns out it is the starter. I left the battery on a overnight charge the last time I went to start it. Anyways I went to the car about a day later and everything was working perfectly fine as far as lights radio etc. However I made a recording of the sound it makes whenever I try to start it. I sent that over to my mechanic it turns out that it was the starter after all.

I forgot to add that I had the battery checked as far as the battery goes it was good. I guess I felt the starter going anyways I will let you know if anything changes and ends up being something else. Thanks for all the help