On my DSlite, the "TTDS GBA & Explorer 2 in 1" slot2 card suddenly stopped working as GBA Exploader is telling me 'slot2 expansion pack not found'. I boot without my slot1 supercard to get to the main menu and it does doesn't show anything in slot2. I opened up the slot2 card and notice a battery. So do I need to periodically change the battery (it has been many years)? Would seems strange for a dead batter make the slot2 card dead as well. Can I just order a new battery or find something at radioshack? Thanks.