Mark, you're asking for someone to talk you out of it, so here's the shot: you're considering trading a soul for a processor.
The M10M is arguably one of the most intentional sensors ever built. Its 'long in the tooth' nature is exactly why itās a masterās toolāitās stable, predictable, and delivers a tonal weight that higher-resolution sensors can sometimes strip away in favor of clinical sharpness. To my eye, the out-of-camera files from the M10M remain superior in their rendering.
I say this as someone who bought the M11M as my first Monochrom. I chose it for the battery life and internal storage, but that was because I didn't have an M10M already. If I did, Iām not sure the 'upgrade' would have improved my work.
I suggest you think of the M10Mās battery life not as a bug, but as a discipline, like the 36-exposure limit of a roll of film. It forces a state of considered intentionality and parsimony. Donāt trade a tool you already have and love for a computer that promises to make things easier (especially in the case of the M11M which in my experience requires post that the M10M doesn't). If the M10 is gathering dust, sell it and buy glass that forces a new perspective.