Its def. The best better I I've ever seen in a smart phone ! You won't need a charger mandatory. I also had the vibrant which I still believe was the only glitch free phone I've owned! you'll have to see this battery to believe it, I can remember seeing threads like these when I had the OG Evo & let me tell ya 12 to 24 hours was just something I couldn't understand with that thing. Not anymore! This was taken with 18% remaining, and started at 95% amazing!
By the way I keep my settings on auto brightness, just under 50%
All Day Strong, All Night Long SGSII!