EV & Battery Manufacturing worked example

Battery Cell First-Pass Yield at 69% target cell first-pass yield: a worked example

Suppose target cell first-pass yield falls to 69%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate battery cell first-pass yield from accepted cells, tested cells, and the production target yield.

The inputs for this scenario

  • Accepted first-pass cells: 46,200 cells (held at the documented default)
  • Total cells tested: 48,000 cells (held at the documented default)
  • Target cell first-pass yield: 69 % (the input this scenario stresses; the baseline uses 96)

Working through the calculation

  • The calculation starts from the formula this tool documents: Cell first-pass yield = accepted first-pass cells รท total cells tested.
  • Cell first-pass yield works out to 96.25 % FPY at these inputs, and this is the headline figure for the scenario.
  • Yield gap to target works out to -27.25 points at these inputs.
  • Accepted cells works out to 46,200 cells at these inputs.
  • Cells tested works out to 48,000 cells at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target cell first-pass yield sits at 96% and the headline result is 96.25 % FPY, this scenario lands almost exactly on the baseline at 96.25 % FPY.
  • It computes accepted first-pass cells as a percentage of total cells tested, then the point gap to your target FPY. 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

  • Cell first-pass yield: 96.25 % FPY (headline result)
  • Yield gap to target: -27.25 points
  • Accepted cells: 46,200 cells
  • Cells tested: 48,000 cells

Run it with your numbers

  • To rerun this with your own numbers, open the live Battery Cell First-Pass Yield calculator, set target cell first-pass yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.