Car having trouble starting without battery boost. Brand new battery. on 2000 Volkswagen Jetta

So I went to start my car and it wouldnt start. I have lights and gauges, but when it comes to starting, its a no go. But when I hook up jumper cables or a portable battery charger it starts right up with no problem or issue. The battery is literally 2 days old and had been changed out just in case of a defective battery. So I went thru two new batteries and was told by my neighbor it wasnt the starter or alternator. So what?????

What kind of battey, what brand just for the hell of it??
Check for loose connections on starter and grounds..
Its an everstart maxx H5. Second battery I got within 2 weeks. Car worked fine for a week and a half.
1 more answer , 2 more comments
perform a parasitic drain test. There might be a system still getting power when the car is turn off.
Even when I turn the car off, I can still hear humming within the block area
YeAh thats a cooling motor circulating the coolant , that s normal, it could be that battery again ,
See if part store will do a battery load test or
Were you bought it...