I just bought an EZ-Flash 3-in-1 Expansion Pack off DealExtreme.com, for use with my R4. I've patched the roms, put in the loader, done everything that the tutorial videos show. However, my games won't save. Specifically, FFTA and Pokemon FireRed won't save, on NOR mode or otherwise. They play perfectly well. I think my problem is that the battery has gone flat. In this case, is it better for me to demand a replacement, or can I just go down to a watch shop and get them to replace the battery? And if I were to replace the battery, which one should I use?