What percentage of phones are sold with removable batteries these days? <5% would be my guess. Kind of irrelevant information really.
Just stick to "Buy an external USB battery pack for $20 and remember to bring your charging cable with you"
There's 75 on that chart out the "600 currently popular phones"
A bunch of them are obsolete windows phones and variants of low end ones. Under 5% by sales seems reasonable to me.
It might be a much larger percentage of "phones used by poor people." This project is aimed at helping homeless people and those at risk of homelessness. My hope is it also has some appeal for others, such as campers and digital nomads. But the central impetus here is to try to start reducing the incidence of homelessness in this country, which is at epidemic levels. This means helping people with minimal tech that may be on the older side and/or super cheap.
I have added both suggestions (USB battery pack and extra batteries) to the battery power management page.
