For a cell phone, that’s almost three years. Most cell phones are probably only able to recharge half its potential in three years.
If they combine this with a battery Instead about that was made out of common materials, you may have something that is worth looking at.
https://newatlas.com/energy/aluminum-sulfur-salt-battery-fast-safe-low-cost/
A little warm for pocket carry? :)
Maybe able to bolster the heater in an EV?
“They can not only operate at high temperatures of up to 200 °C (392 °F) but they actually work better when hotter – at 110 °C (230 °F), the batteries charged 25 times faster than they did at 25 °C (77 °F)”.