Battery dying??

Since about.... i'd say Thurs.. the first thing that happened was on my way to the grocery store my A/F gauge and Voltmeter cut off, I left my car on ACC mode and it was bumpin some bass for like 5 mins, when I came back out it barely started. Since then it coughs to a start, usually takes me a few turns to get it to roll over. So I checked the fuses on the gauges, they were fine, realized the ground came undone, fixed that and they worked fine, but the car is still coughing badly to start. This morning i was packed up for my trip back to NY from ME and it took me like 10 turns for it to finally turn over. I've checked everything, nothing is staying on in my car overnight, the only thing that is on after my key is removed is my capacitor for like 5 mins, a couple blue LEDs. The battery is a brand new Red Top...