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The latest Lunasix type, the 3S, uses silver oxyde batteries which are easiliy avilable. For older types there are adapters, I believe.
Hard to believe but true: I am using a Lunasix 3S from 20 years, not only with my Hasselblad but also with other cameras, and I still have to replace the battery set I purchased with it!
A Gossen exposure meter is a very reliable tool, particularly in average photography. For 10 years I have been using a cheap Sixon without mistaking any exposure. I move to the Lunasix, more than for his sensitivity, for the possibility of blocking the needle that makes so comfortable the reading of exposure.
With many wishes of great pictures!
I use a MINOLTA IVF and also a Sekonic L398A .
Both my models are not available on the market any more .
The SEKONIC has a SUCCESSOR with same name but slightly different power supply inside . No battery required .
The Minolta production has obviously been overtaken bei KENKO and the model is called KFM1100 .
Both my models reading differs by f1/3 .