EV & Battery Manufacturing worked example

Cell Grading Buffer Coverage with graded cell inventory on hand of 48,000 cells: a worked example

Suppose graded cell inventory on hand falls to 48,000 cells. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate protected days of graded-cell supply from inventory, module demand, and a safety factor.

The inputs for this scenario

  • Graded cell inventory on hand: 48,000 cells (the input this scenario stresses; the baseline uses 96,000)
  • Daily graded-cell demand: 18,000 cells / day (held at the documented default)
  • Grading buffer safety factor: 1.25 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Unprotected graded-cell days = graded cell inventory รท daily cell demand.
  • Protected graded-cell coverage works out to 2.13 days at these inputs, and this is the headline figure for the scenario.
  • Unprotected graded-cell days works out to 2.67 days at these inputs.
  • Graded cell inventory works out to 48,000 cells at these inputs.
  • Daily cell demand works out to 18,000 cells / day at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where graded cell inventory on hand sits at 96,000 cells and the headline result is 4.27 days, this scenario comes in 50% below the baseline at 2.13 days.
  • It computes protected graded-cell coverage as inventory divided by daily demand, then divided by the grading buffer safety factor. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Protected graded-cell coverage: 2.13 days (headline result)
  • Unprotected graded-cell days: 2.67 days
  • Graded cell inventory: 48,000 cells
  • Daily cell demand: 18,000 cells / day

Run it with your numbers

  • To rerun this with your own numbers, open the live Cell Grading Buffer Coverage calculator, set graded cell inventory on hand to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.