Such information is more than likely commercially sensitive. However, given the large number of cells, a charge controller can optimise charges to ensure optimum cell use.
Bit like wear levelling with SSD drives.
Your phone probably has an erratic charge discharge cycle.
Most Li-ion batteries have 400-1200 duty cycle. That should give this project a 3 year cycle a least.
Infrastructure is usually measured in decades though, I would have thought < 1 decade isn't good enough. Maybe its easier to maintain large scale batteries.
If its anything like my Nexus 6p it'll need replacing within a year.