An 18650 is twice the thickness of a Fairphone 5. The market for phones that big is small. Those people are probably just going to buy "ruggedized" phones with

An 18650 is twice the thickness of a Fairphone 5. The market for phones that big is small. Those people are probably just going to buy "ruggedized" phones with big lipo cells, like this: https://www.unihertz.com/products/tank https://www.unihertz.com/products/tank 22000mAh battery. Giant ridiculous 1200 lumen flashlight. Weighs more than a pound. A quoted "hundred days" of standby time. Why have replaceable batteries if your phone can go three months without recharging?