The Tesla Model S (Performance Version) Has a Total Battery $\mathrm { kWh }$

The Tesla Model S (performance version) has a total battery capacity of 85 $\mathrm { kWh }$ . The battery pack is composed of a large number of individual Li-ion cells. The cells are $3100 \mathrm { mAh } 18650$ cells that produce $3.6 \mathrm {~V}$ . The designation 18650 refers to the size of the cylindrical battery, $18 \mathrm {~mm}$ in diameter and $65.0 \mathrm {~mm}$ in length. Calculate the number of individual 18650 cells in the Tesla battery pack.