>1. This sounds very useful both as a backup capacity to make calls when your battery died; a smartphone could run in a restricted, super-power-saving mode off

>1. This sounds very useful both as a backup capacity to make calls when your battery died; a smartphone could run in a restricted, super-power-saving mode off that. Could be handy in cities, where there's lots of RF background. Just make 5% battery the new 0% and whatever super-power-saving mode magic you have to run off that 5%. I think that might make more sense in terms of power envelope than to bother with all this stuff.