If you own a Sega Dreamcast, chances are, every time you turn it on, you get prompted to enter the current date/time. This is because your internal battery that powers the chip that stores this data is dead. I grew tired of doing this and decided to do something about it. A Google search for a solution brought me here. I bought a new OEM battery and followed the installation instructions on the site. I learned how to desolder using a "solder-sucker" from one of my co-workers. The whole thing took 10 minutes. I'm very pleased with the outcome. Hopefully I won't have to enter another date for 8-10 years.