It's still a 3DS, but Nintendo insisted that this will be the best 3DS yet, performance-wise. The new 3DS has 3.5-6 hours of battery life, compared to the original's 3-5. The XL has 3.5-7, up from 3.6-6. Nintendo also said that the newer models will have a faster CPU and better 3D effects to avoid some of that pesky…