EV & Battery Manufacturing worked example

EV End-of-Line Test Yield at 99% target eol first-pass yield: a worked example

Push target eol first-pass yield up to 99% and the picture changes. This example computes every intermediate figure at that operating point. an EV assembly, battery pack, inverter, or charger line needs to track first-pass EOL test performance

The inputs for this scenario

  • Units passing EOL first time: 940 units (unchanged)
  • Total units EOL tested: 1,000 units (unchanged)
  • Target EOL first-pass yield: 99 % (raised for this scenario; the documented default is 96)

Working through the calculation

  • Applying the documented formula (EOL first-pass yield = units passing EOL first time รท total units EOL tested) to the inputs above produces each figure below.
  • At this operating point the engine returns 94 % EOL FPY for eol first-pass yield, the number this scenario is built around.
  • At this operating point the engine returns 5 points for eol yield gap to target.
  • At this operating point the engine returns 940 units for first-pass eol passes.
  • At this operating point the engine returns 1,000 units for units eol tested.

How this compares with the baseline

  • Against the tool's baseline example, where target eol first-pass yield sits at 96% and the headline result is 94 % EOL FPY, this scenario lands almost exactly on the baseline at 94 % EOL FPY.
  • It computes the fraction of EOL-tested units that pass on the first attempt as a percent, and the gap in points between that and your FPY target. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • EOL first-pass yield: 94 % EOL FPY (headline result)
  • EOL yield gap to target: 5 points
  • First-pass EOL passes: 940 units
  • Units EOL tested: 1,000 units

Run it with your numbers

  • Every input above is editable in the live EV End-of-Line Test Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.