|I am thinking you have wrong data either from Dell or some other source.|
In almost all cases the voltage and battery chemistry has to be exactly what was stated on the OEM original battery. In some limited cases you can mix chemistry's.Ni-Cad to Li-Ion and such.
I agree that you need to double check at dell.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10