HP
L21621-001
is compatible in the following HP Models:
HP EliteBook 840r Notebook PC series
HP ELITEBOOK 840R G4 BASE MODEL NOTEBOOK PC - 2LG08AV
HP ELITEBOOK 840R G4 NOTEBOOK PC - 5JB75LP
HP ELITEBOOK 840R G4 NOTEBOOK PC - 7XC11EC
HP EliteBook 840 Notebook PC series
HP EliteBook 846r G4 Notebook PC - 3MV04LA