Emilien, the 30% red is handled separately in bug #1388235. That ticket doesn't doesn't directly address mpt's discussion of coloring by percentage on phone but by time on desktop, but it may ameliorate the worst examples of this bug by improving the icons' granularity.
To color by time, we might ultimately need red and nonred versions of each discharging icon.
Emilien, the 30% red is handled separately in bug #1388235. That ticket doesn't doesn't directly address mpt's discussion of coloring by percentage on phone but by time on desktop, but it may ameliorate the worst examples of this bug by improving the icons' granularity.
To color by time, we might ultimately need red and nonred versions of each discharging icon.