These units dimensions are physically identical. Replacing one for the other shouldn’t be any problem just make sure to double check your capacity and voltages.
| Match | Bard WH604 | Bard WL421 | Difference |
|---|---|---|---|
| No matches in measurement | - | - | - |
| Mismatch | Bard WH604 | Bard WL421 | Difference |
|---|---|---|---|
| No mismatches in measurement | - | - | - |