To start off, I'm new to batterys! I replace my car one when needed but other than that there all the same. It has been suggested to me by some fourm members to use 2-3 XS Power D3100 batterys (if space is permitted). Now as we all know the D3100 has 1360CA, 110Ah, and a size of 12.99" x 6.81" x 8.43". Do I went online to price it and I found it for around $370. And just out of curiosity I looked at some other battery's to see what elts there was. I found a Shuriken SK-BT120 for $81 cheaper, relative same size, 1240CA larger, and 10Ah larger. Now this is now a vs post but I'm confused why its cheaper? I just want to know if there's something I don't know about the D3100 that makes it better it there another thing I'm missing other than CA and Ah?