Something to note, Lithium AAA's are coming out sometime this year. I keep some AAA devices for EDC due to the smaller size (Arc AAA, Mag-lite AAA's)
When I was looking for a new cell phone last fall, I started looking for something similar to the old Motorola flipphones with the external removable battery. I found Samsung makes some like that, I got a B/W screen, no camera, removable battery flip phone that is digital and analog capable. Then bought a desktop charger like the old Motorola's and spare battery and car charger and stuck an extra jack in the door pocket of my truck so the charger is always there and always plugged in. This was I always have a spare battery as well as a charged phone since I simply drop it in the charger when I take it off my belt.