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The MRB625 replaces the flat round PX625 mercury battery used in many 1970's SLRs and older Gossen light meters. Mercury battery sale and production is now outlawed within the EC and alkaline replacements where available will give 1.5v, causing metering errors. This zinc-air cell gives the same 1.35v as the original mercury one, is environmentally safe, and has a shelf life of 10 years.
N.B. Once the seal has been removed, zinc-air batteries will continue to provide power, even if the camera meter isn't on. This gives them a working life of about 3 months. If you're not planning on using the camera for a significant period of time, replace the seal to extend battery life.
Note regarding use in the Gossen Lunasix 3
Because of the battery compartment terminal arm dimensions, you will need to place a 13mm conductive washer between it and the MRB625 (e.g. the widely available M6 washer). Other Gossen models don't require this.