Want start only makes a single click when pushing the start button

What is your question?

I accidentally had left my lights on and my battery ended up dying. And I haven't gotten it to crank again since. But when I got back into my car it was showing that it was in battery saving mode on my dashboard. And so I had tried cranking it a few times an at first it would try to crank when I tried cranking it. But now it doesn't do anything but one single click once you try cranking it. I put a brand new battery and starter in my car and still getting the same result. I needs some help?

What makes this problem better or worse?

Nothing is working for me

How long has your 2009 Volvo S80 had this problem?

For about 3 months