The db Electronics Backup RAM Cart holds the maximum allowable memory of 8189 blocks (the Sega CD’s limit for this memory). This is 4 times the save space allotted by the original Sega Backup RAM Cart and a whopping 65 times the Sega CD internal memory. The Backup RAM Cart contains one low-power CMOS 512K x 8 Static RAM powered by a 3V lithium battery. Removing the battery will cause the memory to lose all data. The battery should last for approximately 5000 days. If you replace the battery while the Backup RAM Cart is connected to a powered console you will not lose your data.