Is it normal for housecats to spend time outside? I have two. One is fully indoors, the other goes out 2-3 times per week, for maybe a half hour, and doesn’t venture past our back patio. No hunting that I’m aware of, and definitely no pooping in the neighbor’s garden.

Since you mentioned ssh and vi(m), I’ll throw out vimwiki. No Android app, unless you count termux, and there’s a bit of a learning curve, but idk, it really clicks with me.

My 3rd gen Moto G had a removable back and was also water resistant. Though I don’t think it had a removable battery.