Most of my film shooters are the same. I have a P3 and a P30T that are, respectively, an heirloom (my wife's late father; she will never let me get rid of it, and 'twere pity on my life if I try) and something I initially bought to replace that heirloom when I thought it had failed (but all it did was start me on the path of camera body buying addiction), and a Super Program that I bought to see what the fuss was all about (not much; I scarcely use it). The P30T and possibly the Super Program will one day be my children's training cameras if they get interested in film.
The rest of my film bodies I'm pretty sure will shoot without batteries (bar the ME, which will still shoot at 1/100 when all else is lost), although the Spotmatic F is a special case; I bought that one to shoot with open-aperture on-board metering, seeing as most of my Takumar lenses were appropriately equipped, so I also bought an LR44-PX625 battery housing adapter for it and I will make the appropriate changes to ISO settings or development if I ever find myself completely dependent on the smaller batteries.
Quite aside from the phone, I also have a battery-free Sekonic and I know how to use it.