Originally Posted by theDreamer

From my research the yellow top ones (forget the brand) and braille batteries are both very good compared to stock, but the down side is you cannot let them sit for very long or they just die. I think for the braille battery I was looking at 3 days tops, but you can just throw on a trickle charger if you plan on being gone for a long period and be fine also.

Originally Posted by 370zForever

I agree with Dreamer. The best lightweight ones are braille. The best is the B3121 if you're worried about leaving it out too long or worried it will go dead. It only weighs 21 pounds, which is still good, especially if you're relocating the battery to the back, which improves weight distribution. The other 15 pound batteries are good too, it just depends on your preferences