Have this battery purchased as a replacement for my original Siemens battery, which was swollen and torn suddenly after about 9 years. Here I relied on the reviews of others who thought this battery fit in an SL1. Exactly! Unpacked battery, used and lo and behold - it works perfectly! Battery was already loaded, so that I could make calls immediately. With the performance I am also very pleased, once charged the battery lasts for several days through easily. My department is now more than 4 weeks ago and there not to sue. Should this situation change, I would update here.