I have a couple of questions about slot-2 devices. 1. Will slot-2 devices work in my DS and GBA/SP/Micro? 2. Will I be able to rip saves off of my DS cards with a slot-2? 3. I have heard things about the save batteries. Is there a device that uses a different save method that I wouldn't have to worry about it ever breaking? 4. Which is the best slot-2 device?