It is won't start

What is your question?

Starting problem i only find out that the former battery was dead thinking it was the issue later replace it with another and it worked but later in 2 hours it won't work please what is the problem to this NB it won't even repond pressing on the fob key right from outside

What makes this problem better or worse?

It been parked down for months though

How long has your 2017 GMC Yukon XL had this problem?

2 weeks