For that you have to find the grading grids https://www.indicereparabilite.fr/grilles-de-calcul/ https://www.indicereparabilite.fr/grilles-de-calcul/ which has

For that you have to find the grading grids https://www.indicereparabilite.fr/grilles-de-calcul/ https://www.indicereparabilite.fr/grilles-de-calcul/ which has a set of mower grids, https://www.spareka.fr/media/diagnostics/idr/EN-mower.zip https://www.spareka.fr/media/diagnostics/idr/EN-mower.zip including a cordless mower xlsx, which has an availability sheet. On it, the duration of availability of each component is chosen among the following set: - N/A or X < 5 years - 5 years ≤ X < 7 years - 7 years ≤ X < 9 years - X ≥ 9 years So to have perfect grades, components must be estimated to be available for at least 9 years.