With so much bragging from the M5 owners here, I thought I'd give it a try...
Now, the camera has never been altered (or so says the seller). This means it may need 1.35 V batteries. Do Wein cells do the trick? I know they're short lived, but then, the meter is apparently dying... if not dead already.
Let me know. Thanks for the welcome into the M5 Club! 😉